@@ -1,7 +1,8 @@
11use std::collections::HashMap;
2−use std::hash::{Hash, Hasher};
2+use std::hash::Hash;
33
44use crate::ast::*;
5+use crate::vocab::with_px;
56
67// ---------------------------------------------------------------------------
78// Style collector: deduplicates CSS and assigns class names
@@ -16,52 +17,315 @@ const BREAKPOINTS: &[(&str, &str)] = &[
1617 ("2xl", "1536px"),
1718];
1819
19−/// Generate short CSS class names: a, b, ..., z, a0, a1, ..., z9, aa, ab, ...
20−pub(crate) fn short_class_name(idx: usize) -> String {
21− if idx < 26 {
22− return String::from((b'a' + idx as u8) as char);
20+/// The prefix of every generated class (`hl-2k9xq0m`), which keeps them
21+/// out of the author's own class names.
22+pub const CLASS_PREFIX: &str = "hl-";
23+
24+/// How many base-36 digits a class's name has after `hl-`: 7, about 36
25+/// bits of its style's hash, so a site with 10,000 different styles has
26+/// odds of about 6 in 10,000 that two of them share a name, which
27+/// `htmlang build` reports (`class-collision`). Within one file, a style
28+/// whose name is taken takes more digits.
29+pub const CLASS_DIGITS: usize = 7;
30+
31+/// A stable hash of `text`: FNV-1a, then SplitMix64's finalizer, so every
32+/// digit of a name depends on all of the text. It is the same on every
33+/// platform and in every build, unlike `std`'s hasher.
34+pub fn stable_hash(text: &str) -> u64 {
35+ let mut hash: u64 = 0xcbf2_9ce4_8422_2325;
36+ for byte in text.bytes() {
37+ hash ^= u64::from(byte);
38+ hash = hash.wrapping_mul(0x0000_0100_0000_01b3);
39+ }
40+ hash = (hash ^ (hash >> 30)).wrapping_mul(0xbf58_476d_1ce4_e5b9);
41+ hash = (hash ^ (hash >> 27)).wrapping_mul(0x94d0_49bb_1331_11eb);
42+ hash ^ (hash >> 31)
43+}
44+
45+/// `digits` base-36 digits of `hash`: `2k9xq0m`. With 13, all of it.
46+pub fn hash_digits(hash: u64, digits: usize) -> String {
47+ const DIGITS: &[u8] = b"0123456789abcdefghijklmnopqrstuvwxyz";
48+ let mut n = hash;
49+ (0..digits)
50+ .map(|_| {
51+ let digit = DIGITS[(n % 36) as usize] as char;
52+ n /= 36;
53+ digit
54+ })
55+ .collect()
56+}
57+
58+/// A class htmlang generated: its name, and the hash of the style it
59+/// stands for. One style has one name in every file, so a fragment's
60+/// classes mean the same in any page it goes into.
61+#[derive(Clone, Debug, PartialEq, Eq)]
62+pub struct Class {
63+ pub name: String,
64+ pub style: u64,
65+}
66+
67+/// When a style applies: the at-rule prefixes it is under (their ranks,
68+/// see [`crate::vocab::at_rule_rank`], sorted, so `dark:md:` and `md:dark:`
69+/// are one condition) and its selector prefixes, left to right as the
70+/// selector reads (`hover:children:` is `.a:hover > *`).
71+#[derive(Clone, Default, PartialEq, Eq, Hash, Debug)]
72+struct Condition {
73+ at: Vec<usize>,
74+ selector: Vec<String>,
75+}
76+
77+impl Condition {
78+ /// The condition of an attribute's key, and the name after its
79+ /// prefixes.
80+ fn of(key: &str) -> (Condition, &str) {
81+ let (prefixes, name) = crate::vocab::split_prefixes(key);
82+ let mut condition = Condition::default();
83+ for prefix in prefixes {
84+ match crate::vocab::at_rule_rank(prefix) {
85+ Some(rank) => condition.at.push(rank),
86+ None => condition.selector.push(prefix.to_string()),
87+ }
88+ }
89+ condition.at.sort_unstable();
90+ condition.at.dedup();
91+ (condition, name)
2392 }
24− let mut n = idx - 26;
25− let mut name = String::new();
26− // First char is always a letter
27− name.push((b'a' + (n % 26) as u8) as char);
28− n /= 26;
29− loop {
30− name.push((b'a' + (n % 36).min(25) as u8) as char);
31− if n < 36 {
32− break;
93+
94+ /// Only the at-rule part: a direction under `hover:` is the one without
95+ /// it.
96+ fn at_only(at: &[usize]) -> Condition {
97+ Condition {
98+ at: at.to_vec(),
99+ selector: Vec::new(),
100+ }
101+ }
102+
103+ /// The styles go on the element's children (`children:`).
104+ fn on_children(&self) -> bool {
105+ self.selector.iter().any(|p| p == crate::vocab::CHILDREN)
106+ }
107+
108+ /// The styles go on the elements of one kind inside the element
109+ /// (`@td:`): where the element prefix is in the selector chain.
110+ fn inside(&self) -> Option<usize> {
111+ self.selector
112+ .iter()
113+ .position(|p| crate::vocab::element_prefix(p).is_some())
114+ }
115+
116+ /// Whether this condition holds wherever `other` does: its at-rules
117+ /// are implied by `other`'s, and it has no selector or `other`'s.
118+ fn holds_at(&self, other: &Condition) -> bool {
119+ (self.selector.is_empty() || self.selector == other.selector)
120+ && self.at.iter().all(|&a| {
121+ other
122+ .at
123+ .iter()
124+ .any(|&b| crate::vocab::at_rule_implied(a, b))
125+ })
126+ }
127+
128+ /// The order the rules of each condition are written in, which the
129+ /// cascade follows: no prefix, then selectors, then each at-rule
130+ /// block (see [`at_order`]), with its selectors inside it.
131+ fn order(&self) -> (AtOrder, SelectorOrder) {
132+ (at_order(&self.at), selector_order(&self.selector))
133+ }
134+}
135+
136+/// Where a block of at-rules is written: after the rules without one; by
137+/// its last (innermost) prefix in the order of
138+/// [`crate::vocab::at_rule_prefixes`] (widths, media, container widths), so
139+/// `md:dark:` comes with `dark:`, after it; then by length.
140+type AtOrder = (bool, usize, usize, Vec<usize>);
141+
142+fn at_order(at: &[usize]) -> AtOrder {
143+ (
144+ !at.is_empty(),
145+ at.last().copied().unwrap_or(0),
146+ at.len(),
147+ at.to_vec(),
148+ )
149+}
150+
151+/// Selector chains in the order of [`crate::vocab::PSEUDOS`] (position,
152+/// then form state, then `hover:`, `focus:`, `active:`, `disabled:`), and
153+/// by their argument's text for the same pseudo-class; a chain before the
154+/// longer ones it starts. A chain through `children:` comes after the
155+/// others, ordered by what follows its last `children:` and then by what
156+/// comes before it: only that tail counts toward its specificity (see
157+/// [`selector`]), so `hover:children:` follows `children:` and wins over it
158+/// on hover.
159+type SelectorOrder = (bool, Vec<(usize, String)>, Vec<(usize, String)>);
160+
161+fn selector_order(selector: &[String]) -> SelectorOrder {
162+ let table = crate::vocab::PSEUDOS;
163+ let ranked = |chain: &[String]| -> Vec<(usize, String)> {
164+ chain
165+ .iter()
166+ .map(|p| {
167+ let name = crate::vocab::pseudo_name(p);
168+ let rank = table
169+ .iter()
170+ .position(|(q, _)| *q == name)
171+ .unwrap_or(table.len());
172+ (rank, p.clone())
173+ })
174+ .collect()
175+ };
176+ match selector.iter().rposition(|p| p == crate::vocab::CHILDREN) {
177+ None => (false, ranked(selector), Vec::new()),
178+ Some(i) => (true, ranked(&selector[i + 1..]), ranked(&selector[..i])),
179+ }
180+}
181+
182+/// The order of the chains through an element prefix (`@td:`, see
183+/// [`scoped_selector`]): by the prefixes before it, which select the root
184+/// of the scope and add nothing to the specificity, so `hover:@td:` comes
185+/// after `@td:` and wins on hover; then by the element; then by the
186+/// prefixes after it.
187+fn inside_order(chain: &[String]) -> (SelectorOrder, String, SelectorOrder) {
188+ let at = chain
189+ .iter()
190+ .position(|p| crate::vocab::element_prefix(p).is_some())
191+ .unwrap_or(chain.len());
192+ (
193+ selector_order(&chain[..at]),
194+ chain.get(at).cloned().unwrap_or_default(),
195+ selector_order(chain.get(at + 1..).unwrap_or_default()),
196+ )
197+}
198+
199+/// The selector for `class` under a chain of selector prefixes, read left
200+/// to right. Everything before the last `children:` goes in `:where()`, so
201+/// a parent's `children:` styles have no specificity, and a child's own
202+/// attributes win over them: `children:hover:` is `:where(.a)>*:hover`,
203+/// `hover:children:` is `:where(.a:hover)>*`.
204+fn selector(class: &str, chain: &[String]) -> String {
205+ let last_children = chain.iter().rposition(|p| p == crate::vocab::CHILDREN);
206+ let mut out = format!(".{}", class);
207+ for (i, prefix) in chain.iter().enumerate() {
208+ if prefix == crate::vocab::CHILDREN {
209+ if Some(i) == last_children {
210+ out = format!(":where({})>*", out);
211+ } else {
212+ out.push_str(">*");
213+ }
214+ } else if let Some(pseudo) = crate::vocab::pseudo_selector(prefix) {
215+ out.push_str(&pseudo);
216+ }
217+ }
218+ out
219+}
220+
221+/// The rule for the elements an element prefix picks out inside the
222+/// element with the class `class` (see [`Condition::inside`]): the scope's
223+/// root, from the selector prefixes before it (`hover:@td:` is inside a
224+/// hovered element), and the selector for the elements, from those after
225+/// it (`@td:hover:` is a hovered cell). `:scope td` leaves out the root
226+/// itself, so `@ul [@ul:...]` styles the lists inside, not its own. `None`
227+/// when the name has no tag of its own (the parser reports it).
228+fn scoped_selector(class: &str, chain: &[String], at: usize) -> Option<(String, String)> {
229+ let name = crate::vocab::element_prefix(&chain[at])?;
230+ let tag = ElementKind::from_name(name)?.own_tag()?;
231+ let root = selector(class, &chain[..at]);
232+ let mut target = format!(":scope {}", tag);
233+ for prefix in &chain[at + 1..] {
234+ if let Some(pseudo) = crate::vocab::pseudo_selector(prefix) {
235+ target.push_str(&pseudo);
236+ }
237+ }
238+ Some((root, target))
239+}
240+
241+/// The `@media` or `@container` rule an at-rule prefix stands for, as
242+/// written in readable and in compact output.
243+fn at_rule(rank: usize, dev: bool) -> String {
244+ let prefix = crate::vocab::at_rule_prefixes()
245+ .nth(rank)
246+ .unwrap_or_default();
247+ let name = prefix.trim_end_matches(':');
248+ let width = |name: &str| {
249+ BREAKPOINTS
250+ .iter()
251+ .find(|(n, _)| *n == name)
252+ .map_or("0", |(_, w)| *w)
253+ };
254+ let (kind, feature, value) = if let Some(size) = name.strip_prefix("cq-") {
255+ ("@container", "min-width", width(size))
256+ } else {
257+ match name {
258+ "print" => {
259+ return "@media print".to_string();
260+ }
261+ "dark" => ("@media", "prefers-color-scheme", "dark"),
262+ "motion-safe" => ("@media", "prefers-reduced-motion", "no-preference"),
263+ "motion-reduce" => ("@media", "prefers-reduced-motion", "reduce"),
264+ "landscape" | "portrait" => ("@media", "orientation", name),
265+ _ => ("@media", "min-width", width(name)),
33266 }
34− n /= 36;
267+ };
268+ if dev {
269+ format!("{} ({}: {})", kind, feature, value)
270+ } else {
271+ format!("{}({}:{})", kind, feature, value)
35272 }
36− // Reverse so it reads naturally
37− name.chars().rev().collect()
273+}
274+
275+/// A style as text, for its hash: the defaults of its element's kind, its
276+/// rules (the at-rules' ranks, the selector prefixes and the declarations
277+/// of each) and the rules keyed on it, each part ended by a character CSS
278+/// doesn't have.
279+fn style_text(defaults: &str, rules: &[(Condition, String)], distinct: &str) -> String {
280+ let mut text = format!("{defaults}\u{1}");
281+ for (condition, body) in rules {
282+ for rank in &condition.at {
283+ text.push_str(&format!("{rank}\u{2}"));
284+ }
285+ text.push('\u{3}');
286+ for prefix in &condition.selector {
287+ text.push_str(prefix);
288+ text.push('\u{2}');
289+ }
290+ text.push('\u{3}');
291+ text.push_str(body);
292+ text.push('\u{1}');
293+ }
294+ text.push_str(distinct);
295+ text
38296}
39297
40298struct StyleEntry {
41299 class_name: String,
42− base: String,
43− /// (CSS selector suffix, css_rules) — e.g. (":hover", "color:red;")
44− pseudo: Vec<(String, String)>,
45− /// Responsive overrides: (breakpoint_prefix, css)
46− responsive: Vec<(String, String)>,
47− /// Dark mode overrides
48− dark: String,
49− /// Print overrides
50− print: String,
51− motion_safe: String,
52− motion_reduce: String,
53− landscape: String,
54− portrait: String,
55− /// Container query overrides: (breakpoint_prefix, css)
56− container: Vec<(String, String)>,
300+ /// The hash of the style, which names the class
301+ style: u64,
302+ /// The defaults of the element's kind (its layout, a heading's
303+ /// `margin:0`, ...), less what its own attributes set. They are written
304+ /// as `:where(.hl-a)` in the layer `hl-kind`, so an element prefix
305+ /// around it (`@h2:`), its parent's `children:` styles and its own
306+ /// attributes, all in later layers, win over them.
307+ defaults: String,
308+ /// The element's rules: under each condition, its declarations, in the
309+ /// order they are written
310+ rules: Vec<(Condition, String)>,
311+ /// What else tells two elements with the same CSS apart: the rules
312+ /// keyed on this class (see [`StyleCollector::keyed`]). Not written.
313+ distinct: String,
57314}
58315
59316struct StyleCollector {
60317 entries: Vec<StyleEntry>,
61− /// Maps a pre-hashed style signature to an index into `entries`.
62− /// Using u64 as the key keeps lookups allocation-free; on the rare case of
63− /// a hash collision we fall back to a full equality check against the entry.
318+ /// Maps a style's hash to its entries (more than one only when two
319+ /// styles hash alike, which the full comparison tells apart).
64320 index: HashMap<u64, Vec<usize>>,
321+ /// The names given, which a style whose name is taken doesn't get
322+ names: std::collections::HashSet<String>,
323+ /// Rules for an element's children, keyed on its class and written in
324+ /// the block of an at-rule condition: `(at-rules, selector, body)`, e.g.
325+ /// `([md], ":where(.a)>.b", "flex:1;")` (see [`Flow`]).
326+ keyed: Vec<(Vec<usize>, String, String)>,
327+ /// The keyed rules already added
328+ keyed_seen: std::collections::HashSet<(Vec<usize>, String, String)>,
65329}
66330
67331impl StyleCollector {
@@ -69,342 +333,328 @@ impl StyleCollector {
69333 StyleCollector {
70334 entries: Vec::new(),
71335 index: HashMap::new(),
336+ names: std::collections::HashSet::new(),
337+ keyed: Vec::new(),
338+ keyed_seen: std::collections::HashSet::new(),
339+ }
340+ }
341+
342+ /// Add a rule for `selector` under the at-rules `at`, once.
343+ fn add_keyed(&mut self, at: Vec<usize>, selector: String, body: String) {
344+ let rule = (at, selector, body);
345+ if self.keyed_seen.insert(rule.clone()) {
346+ self.keyed.push(rule);
72347 }
73348 }
74349
75350 /// Returns a class name for this style combination, or None if all empty.
76− #[allow(clippy::too_many_arguments)]
77351 fn get_class(
78352 &mut self,
79− base: String,
80− pseudo: Vec<(String, String)>,
81− responsive: Vec<(String, String)>,
82− dark: String,
83− print: String,
84− motion_safe: String,
85− motion_reduce: String,
86− landscape: String,
87− portrait: String,
88− container: Vec<(String, String)>,
353+ defaults: String,
354+ mut rules: Vec<(Condition, String)>,
355+ distinct: String,
89356 ) -> Option<String> {
90− if base.is_empty()
91− && pseudo.is_empty()
92− && responsive.is_empty()
93− && dark.is_empty()
94− && print.is_empty()
95− && motion_safe.is_empty()
96− && motion_reduce.is_empty()
97− && landscape.is_empty()
98− && portrait.is_empty()
99− && container.is_empty()
100− {
357+ rules.retain(|(_, body)| !body.is_empty());
358+ if defaults.is_empty() && rules.is_empty() {
101359 return None;
102360 }
103− use std::collections::hash_map::DefaultHasher;
104− let mut h = DefaultHasher::new();
105− base.hash(&mut h);
106− pseudo.hash(&mut h);
107− responsive.hash(&mut h);
108− dark.hash(&mut h);
109− print.hash(&mut h);
110− motion_safe.hash(&mut h);
111− motion_reduce.hash(&mut h);
112− landscape.hash(&mut h);
113− portrait.hash(&mut h);
114− container.hash(&mut h);
115− let sig = h.finish();
116−
117− if let Some(indices) = self.index.get(&sig) {
361+ rules.sort_by_cached_key(|(condition, _)| condition.order());
362+ let style = stable_hash(&style_text(&defaults, &rules, &distinct));
363+
364+ if let Some(indices) = self.index.get(&style) {
118365 for &idx in indices {
119366 let e = &self.entries[idx];
120− if e.base == base
121− && e.pseudo == pseudo
122− && e.responsive == responsive
123− && e.dark == dark
124− && e.print == print
125− && e.motion_safe == motion_safe
126− && e.motion_reduce == motion_reduce
127− && e.landscape == landscape
128− && e.portrait == portrait
129− && e.container == container
130− {
367+ if e.defaults == defaults && e.rules == rules && e.distinct == distinct {
131368 return Some(e.class_name.clone());
132369 }
133370 }
134371 }
372+ // The name is the hash's first digits, and more of them when
373+ // another style of this file has those; after all 13, the entry's
374+ // number tells the two apart
135375 let idx = self.entries.len();
136− let name = short_class_name(idx);
376+ let name = (CLASS_DIGITS..=13)
377+ .map(|digits| format!("{}{}", CLASS_PREFIX, hash_digits(style, digits)))
378+ .find(|name| !self.names.contains(name))
379+ .unwrap_or_else(|| format!("{}{}{}", CLASS_PREFIX, hash_digits(style, 13), idx));
380+ self.names.insert(name.clone());
137381 self.entries.push(StyleEntry {
138382 class_name: name.clone(),
139− base,
140− pseudo,
141− responsive,
142− dark,
143− print,
144− motion_safe,
145− motion_reduce,
146− landscape,
147− portrait,
148− container,
383+ style,
384+ defaults,
385+ rules,
386+ distinct,
149387 });
150− self.index.entry(sig).or_default().push(idx);
388+ self.index.entry(style).or_default().push(idx);
151389 Some(name)
152390 }
153391
154− fn to_css_formatted(&self, dev: bool, use_layer: bool) -> String {
155− let mut css = String::new();
156− let (sp, nl) = if dev { (" ", "\n") } else { ("", "") };
392+ /// The classes given, in the order they were
393+ fn classes(&self) -> impl Iterator<Item = Class> + '_ {
394+ self.entries.iter().map(|e| Class {
395+ name: e.class_name.clone(),
396+ style: e.style,
397+ })
398+ }
157399
158− // Wrap in @layer for specificity management
159− if use_layer {
400+ /// All generated rules, in three layers (see [`LAYERS`]): the element
401+ /// kinds' defaults in `hl-kind` (`:where(.hl-a)`), the rules for the
402+ /// elements an element prefix picks out inside an element (`@td:`), and
403+ /// a function's scoped `@style`, in `hl-inside`, and the elements' own
404+ /// rules in `htmlang`. They are written in a fixed order, so which rule
405+ /// wins never depends on where in the page an element is: the rules
406+ /// without a prefix, then those under selector prefixes, then each block
407+ /// of at-rules (see [`at_order`]), in which the rules keyed on a parent
408+ /// come first, then the element's own, then its selectors (see
409+ /// [`selector_order`]).
410+ fn to_css_formatted(&self, dev: bool, scoped: &[String]) -> String {
411+ // The defaults: `:where(.hl-a,.hl-b){...}`
412+ let mut kind = String::new();
413+ let mut defaults: Vec<(&str, Vec<&str>)> = Vec::new();
414+ for e in self.entries.iter().filter(|e| !e.defaults.is_empty()) {
415+ match defaults.iter_mut().find(|(body, _)| *body == e.defaults) {
416+ Some((_, classes)) => classes.push(&e.class_name),
417+ None => defaults.push((&e.defaults, vec![&e.class_name])),
418+ }
419+ }
420+ for (body, classes) in defaults {
421+ let classes: Vec<String> = classes.iter().map(|c| format!(".{}", c)).collect();
422+ let selector = format!(":where({})", classes.join(","));
160423 if dev {
161− css.push_str("@layer htmlang {\n");
424+ kind.push_str(&format!(" {} {{{}}}\n", selector, body));
162425 } else {
163− css.push_str("@layer htmlang{");
164− }
165− }
166−
167− // Non-responsive rules
168− for e in &self.entries {
169− if !e.base.is_empty() {
170− if use_layer && dev {
171− css.push_str(&format!(" .{}{sp}{{{}}}{nl}", e.class_name, e.base));
172− } else {
173− css.push_str(&format!(".{}{sp}{{{}}}{nl}", e.class_name, e.base));
174− }
175− }
176− for (selector, pseudo_css) in &e.pseudo {
177− if !pseudo_css.is_empty() {
178− if use_layer && dev {
179− css.push_str(&format!(
180− " .{}{}{sp}{{{}}}{nl}",
181− e.class_name, selector, pseudo_css
182− ));
183− } else {
184− css.push_str(&format!(
185− ".{}{}{sp}{{{}}}{nl}",
186− e.class_name, selector, pseudo_css
187− ));
188− }
189− }
190− }
191− }
192−
193− // Responsive rules grouped by breakpoint
194− for &(bp_name, bp_width) in BREAKPOINTS {
195− let mut bp_css = String::new();
196− for e in &self.entries {
197− for (bp, rule_css) in &e.responsive {
198− if bp == bp_name && !rule_css.is_empty() {
199− if dev {
200− bp_css.push_str(&format!(" .{} {{{}}}\n", e.class_name, rule_css));
201− } else {
202− bp_css.push_str(&format!(".{}{{{}}}", e.class_name, rule_css));
203− }
204− }
205− }
206− }
207− if !bp_css.is_empty() {
208− if dev {
209− css.push_str(&format!(
210− "@media (min-width: {}) {{\n{}}}\n",
211− bp_width, bp_css
212− ));
213− } else {
214− css.push_str(&format!("@media(min-width:{}){{{}}}", bp_width, bp_css));
215− }
426+ kind.push_str(&format!("{}{{{}}}", selector, body));
216427 }
217428 }
218429
219− // Dark mode rules
220− let mut dark_css = String::new();
221− for e in &self.entries {
222− if !e.dark.is_empty() {
223− if dev {
224− dark_css.push_str(&format!(" .{} {{{}}}\n", e.class_name, e.dark));
225− } else {
226− dark_css.push_str(&format!(".{}{{{}}}", e.class_name, e.dark));
227− }
228− }
229− }
230− if !dark_css.is_empty() {
430+ let mut inside = self.blocks(true, dev);
431+ // A function's scoped `@style`, nested under its class
432+ for block in scoped {
231433 if dev {
232− css.push_str(&format!(
233− "@media (prefers-color-scheme: dark) {{\n{}}}\n",
234− dark_css
235− ));
434+ inside.push_str(block);
435+ inside.push('\n');
236436 } else {
237− css.push_str(&format!(
238− "@media(prefers-color-scheme:dark){{{}}}",
239− dark_css
240− ));
437+ inside.push_str(&compact_css(block));
241438 }
242439 }
243440
244− // Print rules
245− let mut print_css = String::new();
246− for e in &self.entries {
247− if !e.print.is_empty() {
248− if dev {
249− print_css.push_str(&format!(" .{} {{{}}}\n", e.class_name, e.print));
250− } else {
251− print_css.push_str(&format!(".{}{{{}}}", e.class_name, e.print));
252− }
441+ let mut css = String::new();
442+ for (name, rules) in [
443+ ("hl-kind", kind),
444+ ("hl-inside", inside),
445+ ("htmlang", self.blocks(false, dev)),
446+ ] {
447+ if rules.is_empty() {
448+ continue;
253449 }
254− }
255− if !print_css.is_empty() {
256450 if dev {
257− css.push_str(&format!("@media print {{\n{}}}\n", print_css));
451+ css.push_str(&format!("@layer {} {{\n{}}}\n", name, rules));
258452 } else {
259− css.push_str(&format!("@media print{{{}}}", print_css));
453+ css.push_str(&format!("@layer {}{{{}}}", name, rules));
260454 }
261455 }
456+ css
457+ }
262458
263− // Motion safe rules
264− let mut motion_safe_css = String::new();
265− for e in &self.entries {
266− if !e.motion_safe.is_empty() {
267− if dev {
268− motion_safe_css
269− .push_str(&format!(" .{} {{{}}}\n", e.class_name, e.motion_safe));
459+ /// The rules of every block of at-rules, in order: those for the
460+ /// elements inside (`inside`: rules under an element prefix, each in
461+ /// an `@scope` on its element's class), or the elements' own.
462+ fn blocks(&self, inside: bool, dev: bool) -> String {
463+ let mut css = String::new();
464+ let rules = || {
465+ self.entries.iter().flat_map(move |e| {
466+ e.rules
467+ .iter()
468+ .filter(move |(c, _)| c.inside().is_some() == inside)
469+ .map(move |(c, body)| (e, c, body))
470+ })
471+ };
472+ let mut blocks: Vec<&[usize]> = vec![&[]];
473+ let keyed = self.keyed.iter().filter(|_| !inside);
474+ let every = rules()
475+ .map(|(_, c, _)| c.at.as_slice())
476+ .chain(keyed.map(|(at, _, _)| at.as_slice()));
477+ for at in every {
478+ if !blocks.contains(&at) {
479+ blocks.push(at);
480+ }
481+ }
482+ blocks.sort_by_key(|at| at_order(at));
483+
484+ for at in blocks {
485+ let depth = at.len();
486+ // Readable output indents a rule inside `@layer` and inside
487+ // each at-rule but the first
488+ let indent = if dev {
489+ " ".repeat(depth.max(1))
490+ } else {
491+ String::new()
492+ };
493+ let mut inner = String::new();
494+ // Rules keyed on a parent's class come first: they have the
495+ // specificity of one class, like a class rule, so the child's
496+ // own rules in the block still win
497+ if !inside {
498+ let keyed: Vec<(&str, &str)> = self
499+ .keyed
500+ .iter()
501+ .filter(|(a, _, _)| a.as_slice() == at)
502+ .map(|(_, selector, body)| (selector.as_str(), body.as_str()))
503+ .collect();
504+ emit_selector_rules(&mut inner, &keyed, &indent, dev);
505+ }
506+ // The selector chains of this block, in order
507+ let mut chains: Vec<&[String]> = Vec::new();
508+ for (_, condition, _) in rules() {
509+ if condition.at == at && !chains.contains(&condition.selector.as_slice()) {
510+ chains.push(&condition.selector);
511+ }
512+ }
513+ if inside {
514+ chains.sort_by_cached_key(|chain| inside_order(chain));
515+ // One `@scope` for each root, its rules in the order of
516+ // the chains: rules for one element under two roots (`.a`
517+ // and `.a:hover`) tie on specificity and proximity, so the
518+ // later one wins
519+ let mut scopes: Vec<(String, Vec<(String, &str)>)> = Vec::new();
520+ for chain in chains {
521+ let Some(element) = chain
522+ .iter()
523+ .position(|p| crate::vocab::element_prefix(p).is_some())
524+ else {
525+ continue;
526+ };
527+ for (e, _, body) in
528+ rules().filter(|(_, c, _)| c.at == at && c.selector == chain)
529+ {
530+ let Some((root, target)) = scoped_selector(&e.class_name, chain, element)
531+ else {
532+ continue;
533+ };
534+ match scopes.iter_mut().find(|(r, _)| *r == root) {
535+ Some((_, targets)) => targets.push((target, body)),
536+ None => scopes.push((root, vec![(target, body)])),
537+ }
538+ }
539+ }
540+ let inner_indent = if dev {
541+ format!("{} ", indent)
270542 } else {
271− motion_safe_css.push_str(&format!(".{}{{{}}}", e.class_name, e.motion_safe));
543+ String::new()
544+ };
545+ for (root, targets) in scopes {
546+ let targets: Vec<(&str, &str)> =
547+ targets.iter().map(|(t, b)| (t.as_str(), *b)).collect();
548+ inner.push_str(&indent);
549+ inner.push_str(&format!("@scope ({})", root));
550+ inner.push_str(if dev { " {\n" } else { "{" });
551+ emit_selector_rules(&mut inner, &targets, &inner_indent, dev);
552+ inner.push_str(&indent);
553+ inner.push_str(if dev { "}\n" } else { "}" });
272554 }
273− }
274− }
275− if !motion_safe_css.is_empty() {
276− if dev {
277− css.push_str(&format!(
278− "@media (prefers-reduced-motion: no-preference) {{\n{}}}\n",
279− motion_safe_css
280− ));
281555 } else {
282− css.push_str(&format!(
283− "@media(prefers-reduced-motion:no-preference){{{}}}",
284− motion_safe_css
285− ));
286− }
287− }
288−
289− // Motion reduce rules
290− let mut motion_reduce_css = String::new();
291− for e in &self.entries {
292− if !e.motion_reduce.is_empty() {
293− if dev {
294− motion_reduce_css
295− .push_str(&format!(" .{} {{{}}}\n", e.class_name, e.motion_reduce));
296− } else {
297− motion_reduce_css
298− .push_str(&format!(".{}{{{}}}", e.class_name, e.motion_reduce));
556+ chains.sort_by_cached_key(|chain| selector_order(chain));
557+ for chain in chains {
558+ let pairs: Vec<(String, &str)> = rules()
559+ .filter(|(_, c, _)| c.at == at && c.selector == chain)
560+ .map(|(e, _, body)| (selector(&e.class_name, chain), body.as_str()))
561+ .collect();
562+ emit_grouped_rules(&mut inner, &pairs, &indent, dev);
299563 }
300564 }
301− }
302− if !motion_reduce_css.is_empty() {
303− if dev {
304− css.push_str(&format!(
305− "@media (prefers-reduced-motion: reduce) {{\n{}}}\n",
306− motion_reduce_css
307− ));
308− } else {
309− css.push_str(&format!(
310− "@media(prefers-reduced-motion:reduce){{{}}}",
311− motion_reduce_css
312− ));
565+ if inner.is_empty() {
566+ continue;
313567 }
314− }
315−
316− // Landscape rules
317− let mut landscape_css = String::new();
318− for e in &self.entries {
319− if !e.landscape.is_empty() {
320− if dev {
321− landscape_css.push_str(&format!(" .{} {{{}}}\n", e.class_name, e.landscape));
568+ // Each at-rule wraps the next, outermost first
569+ for (level, &rank) in at.iter().enumerate().rev() {
570+ let pad = if dev {
571+ " ".repeat(level)
322572 } else {
323− landscape_css.push_str(&format!(".{}{{{}}}", e.class_name, e.landscape));
324− }
325− }
326− }
327− if !landscape_css.is_empty() {
328− if dev {
329− css.push_str(&format!(
330− "@media (orientation: landscape) {{\n{}}}\n",
331− landscape_css
332− ));
333− } else {
334− css.push_str(&format!(
335− "@media(orientation:landscape){{{}}}",
336− landscape_css
337− ));
573+ String::new()
574+ };
575+ inner = if dev {
576+ format!("{pad}{} {{\n{inner}{pad}}}\n", at_rule(rank, true))
577+ } else {
578+ format!("{}{{{inner}}}", at_rule(rank, false))
579+ };
338580 }
581+ css.push_str(&inner);
339582 }
583+ css
584+ }
585+}
340586
341− // Portrait rules
342− let mut portrait_css = String::new();
343− for e in &self.entries {
344− if !e.portrait.is_empty() {
345− if dev {
346− portrait_css.push_str(&format!(" .{} {{{}}}\n", e.class_name, e.portrait));
347− } else {
348− portrait_css.push_str(&format!(".{}{{{}}}", e.class_name, e.portrait));
349− }
350− }
587+/// Emit CSS rules from `(selector, body)` pairs, merging identical bodies
588+/// into a single selector-list rule (e.g. `.a,.b{body}`). The first occurrence
589+/// of each distinct body determines ordering, so output stays deterministic
590+/// across runs. `indent` is prepended to each rule line.
591+fn emit_grouped_rules(out: &mut String, pairs: &[(String, &str)], indent: &str, dev: bool) {
592+ if pairs.is_empty() {
593+ return;
594+ }
595+ // Group in first-occurrence order.
596+ let mut order: Vec<&str> = Vec::new();
597+ let mut groups: HashMap<&str, Vec<&str>> = HashMap::new();
598+ for (selector, body) in pairs {
599+ if body.is_empty() {
600+ continue;
351601 }
352− if !portrait_css.is_empty() {
353− if dev {
354− css.push_str(&format!(
355− "@media (orientation: portrait) {{\n{}}}\n",
356− portrait_css
357− ));
358− } else {
359− css.push_str(&format!("@media(orientation:portrait){{{}}}", portrait_css));
360− }
602+ if !groups.contains_key(body) {
603+ order.push(body);
361604 }
605+ groups.entry(body).or_default().push(selector);
606+ }
607+ let sp = if dev { " " } else { "" };
608+ let nl = if dev { "\n" } else { "" };
609+ for body in &order {
610+ out.push_str(indent);
611+ out.push_str(&groups[body].join(","));
612+ out.push_str(sp);
613+ out.push('{');
614+ out.push_str(body);
615+ out.push('}');
616+ out.push_str(nl);
617+ }
618+}
362619
363− // Container query rules grouped by breakpoint
364− for &(bp_name, bp_width) in BREAKPOINTS {
365− let mut cq_css = String::new();
366− for e in &self.entries {
367− for (bp, rule_css) in &e.container {
368− if bp == bp_name && !rule_css.is_empty() {
369− if dev {
370− cq_css.push_str(&format!(" .{} {{{}}}\n", e.class_name, rule_css));
371− } else {
372− cq_css.push_str(&format!(".{}{{{}}}", e.class_name, rule_css));
373− }
374− }
375− }
376− }
377− if !cq_css.is_empty() {
378− if dev {
379− css.push_str(&format!(
380− "@container (min-width: {}) {{\n{}}}\n",
381− bp_width, cq_css
382− ));
383− } else {
384− css.push_str(&format!("@container(min-width:{}){{{}}}", bp_width, cq_css));
385− }
620+/// Emit `(selector, body)` rules in their order, merging a run of rules
621+/// with the same body into one rule with a selector list (the order
622+/// matters: two rules may apply to one element).
623+fn emit_selector_rules(out: &mut String, rules: &[(&str, &str)], indent: &str, dev: bool) {
624+ let mut i = 0;
625+ while i < rules.len() {
626+ let body = rules[i].1;
627+ let run = rules[i..].iter().take_while(|(_, b)| *b == body).count();
628+ if !body.is_empty() {
629+ let selectors: Vec<&str> = rules[i..i + run].iter().map(|(s, _)| *s).collect();
630+ out.push_str(indent);
631+ out.push_str(&selectors.join(","));
632+ if dev {
633+ out.push(' ');
386634 }
387− }
388−
389− // Close @layer
390− if use_layer {
635+ out.push('{');
636+ out.push_str(body);
637+ out.push('}');
391638 if dev {
392− css.push_str("}\n");
393− } else {
394− css.push('}');
639+ out.push('\n');
395640 }
396641 }
397−
398− css
642+ i += run;
399643 }
400644}
401645
402646struct GenContext {
403647 dev: bool,
404648 depth: usize,
405− image_count: usize,
406649 has_interactive: bool,
407− has_defer: bool,
650+ /// Writing inside a text element, at any depth: htmlang's own `<div>`s
651+ /// are `<span>`s there, which text can hold.
652+ in_text: bool,
653+ /// How the element whose children are being written lays them out
654+ flow: Flow,
655+ /// Writing the children of a `@picture`, where `@source`'s leading
656+ /// argument is its `srcset`
657+ in_picture: bool,
408658}
409659
410660impl GenContext {
@@ -430,23 +680,26 @@ pub struct CodegenOptions {
430680 pub dev: bool,
431681 pub partial: bool,
432682 pub minify: bool,
433− pub compat: bool,
434683}
435684
436685/// Generate HTML from a parsed document using the given options.
437686pub fn generate_with(doc: &Document, opts: &CodegenOptions) -> String {
687+ generate_with_classes(doc, opts).0
688+}
689+
690+/// [`generate_with`], and the classes the document's styles were given,
691+/// for a check across files that no name stands for two styles.
692+pub fn generate_with_classes(doc: &Document, opts: &CodegenOptions) -> (String, Vec<Class>) {
693+ let mut classes = Vec::new();
438694 let mut html = if opts.partial {
439− generate_partial_inner(doc, opts.dev)
695+ generate_partial_inner(doc, opts.dev, &mut classes)
440696 } else {
441− generate_full_inner(doc, opts.dev)
697+ generate_full_inner(doc, opts.dev, &mut classes)
442698 };
443699 if opts.minify {
444700 html = minify_html(&html);
445701 }
446− if opts.compat {
447− html = add_vendor_prefixes(&html);
448− }
449− html
702+ (html, classes)
450703}
451704
452705pub fn generate(doc: &Document) -> String {
@@ -494,38 +747,6 @@ pub fn generate_minified(doc: &Document) -> String {
494747 )
495748}
496749
497−pub fn generate_compat(doc: &Document) -> String {
498− generate_with(
499− doc,
500− &CodegenOptions {
501− compat: true,
502− ..Default::default()
503− },
504− )
505−}
506−
507−pub fn generate_dev_compat(doc: &Document) -> String {
508− generate_with(
509− doc,
510− &CodegenOptions {
511− dev: true,
512− compat: true,
513− ..Default::default()
514− },
515− )
516−}
517−
518−pub fn generate_minified_compat(doc: &Document) -> String {
519− generate_with(
520− doc,
521− &CodegenOptions {
522− minify: true,
523− compat: true,
524− ..Default::default()
525− },
526− )
527−}
528−
529750fn minify_html(html: &str) -> String {
530751 let mut result = String::with_capacity(html.len());
531752 let mut in_pre = false;
@@ -540,9 +761,9 @@ fn minify_html(html: &str) -> String {
540761 if i + 4 < chars.len() && chars[i] == '<' {
541762 let rest: String = chars[i..].iter().take(10).collect();
542763 let rest_lower = rest.to_lowercase();
543− if rest_lower.starts_with("<pre") {
764+ if rest_lower.starts_with("<pre") || rest_lower.starts_with("<textarea") {
544765 in_pre = true;
545− } else if rest_lower.starts_with("</pre") {
766+ } else if rest_lower.starts_with("</pre") || rest_lower.starts_with("</textarea") {
546767 in_pre = false;
547768 } else if rest_lower.starts_with("<script") {
548769 in_script = true;
@@ -584,10 +805,11 @@ fn minify_html(html: &str) -> String {
584805 continue;
585806 }
586807
587− // Collapse whitespace between tags
808+ // Collapse whitespace runs to a single space. Spaces are never
809+ // dropped entirely: next to inline elements they are significant
810+ // ("Built with <span>" must keep its space).
588811 if chars[i].is_whitespace() {
589812 if !prev_was_space {
590− // Only emit a space if we're between content (not between tags)
591813 result.push(' ');
592814 prev_was_space = true;
593815 }
@@ -595,14 +817,6 @@ fn minify_html(html: &str) -> String {
595817 continue;
596818 }
597819
598− // Trim space before closing tags
599− if chars[i] == '<' && prev_was_space {
600− // Remove trailing space before tag
601− if result.ends_with(' ') {
602− result.pop();
603− }
604− }
605−
606820 prev_was_space = false;
607821 result.push(chars[i]);
608822 i += 1;
@@ -611,717 +825,288 @@ fn minify_html(html: &str) -> String {
611825 result
612826}
613827
614−/// Add vendor prefixes to CSS within <style> tags for broader browser compatibility.
615−fn add_vendor_prefixes(html: &str) -> String {
616− // Find CSS within <style>...</style> and add vendor prefixes
617− let mut result = String::with_capacity(html.len() + 512);
618− let mut rest = html;
619− while let Some(start) = rest.find("<style>") {
620− let after_tag = start + 7;
621− result.push_str(&rest[..after_tag]);
622− rest = &rest[after_tag..];
623− if let Some(end) = rest.find("</style>") {
624− let css = &rest[..end];
625− result.push_str(&prefix_css(css));
626− result.push_str("</style>");
627− rest = &rest[end + 8..];
628− } else {
629− break;
630− }
631− }
632− result.push_str(rest);
633− result
634−}
635−
636−fn prefix_css(css: &str) -> String {
637− let mut out = String::with_capacity(css.len() + 256);
638− let mut i = 0;
639− let bytes = css.as_bytes();
640− while i < bytes.len() {
641− // Find property declarations
642− if let Some(pos) = css[i..].find('{') {
643− let brace = i + pos;
644− out.push_str(&css[i..=brace]);
645− i = brace + 1;
646− // Process declarations within this block
647− if let Some(close) = css[i..].find('}') {
648− let block = &css[i..i + close];
649− out.push_str(&prefix_declarations(block));
650− out.push('}');
651− i = i + close + 1;
652− }
653− } else {
654− out.push_str(&css[i..]);
655− break;
656− }
657− }
658− out
659−}
660−
661−fn prefix_declarations(block: &str) -> String {
662− let mut out = String::with_capacity(block.len() + 128);
663− for decl in block.split(';') {
664− let decl = decl.trim();
665− if decl.is_empty() {
666− continue;
667− }
668− if let Some((prop, val)) = decl.split_once(':') {
669− let prop = prop.trim();
670− let val = val.trim();
671− match prop {
672− "backdrop-filter" => {
673− out.push_str(&format!("-webkit-backdrop-filter:{};", val));
674− out.push_str(&format!("backdrop-filter:{};", val));
675− }
676− "user-select" => {
677− out.push_str(&format!("-webkit-user-select:{};", val));
678− out.push_str(&format!("-moz-user-select:{};", val));
679− out.push_str(&format!("user-select:{};", val));
680− }
681− "appearance" => {
682− out.push_str(&format!("-webkit-appearance:{};", val));
683− out.push_str(&format!("-moz-appearance:{};", val));
684− out.push_str(&format!("appearance:{};", val));
685− }
686− "background-clip" if val.contains("text") => {
687− out.push_str(&format!("-webkit-background-clip:{};", val));
688− out.push_str(&format!("background-clip:{};", val));
689− }
690− "hyphens" => {
691− out.push_str(&format!("-webkit-hyphens:{};", val));
692− out.push_str(&format!("-ms-hyphens:{};", val));
693− out.push_str(&format!("hyphens:{};", val));
694− }
695− "text-size-adjust" => {
696− out.push_str(&format!("-webkit-text-size-adjust:{};", val));
697− out.push_str(&format!("-ms-text-size-adjust:{};", val));
698− out.push_str(&format!("text-size-adjust:{};", val));
699− }
700− "mask-image" | "mask-size" | "mask-repeat" | "mask-position" => {
701− out.push_str(&format!("-webkit-{}:{};", prop, val));
702− out.push_str(&format!("{}:{};", prop, val));
703− }
704− _ => {
705− out.push_str(decl);
706− out.push(';');
707− }
708− }
709− } else {
710− out.push_str(decl);
711− out.push(';');
712− }
713− }
714− out
715−}
716−
717−fn generate_full_inner(doc: &Document, dev: bool) -> String {
828+fn generate_full_inner(doc: &Document, dev: bool, classes: &mut Vec<Class>) -> String {
829+ // Without `@page` the output is a fragment
830+ let Some(page) = &doc.page else {
831+ return generate_partial_inner(doc, dev, classes);
832+ };
718833 let mut styles = StyleCollector::new();
719834 let mut ctx = GenContext {
720835 dev,
721836 depth: 0,
722− image_count: 0,
723837 has_interactive: false,
724− has_defer: false,
838+ in_text: false,
839+ flow: Flow::default(),
840+ in_picture: false,
725841 };
726842
727− // Check if document has @main for skip-to-content link
728− let has_main = has_element_kind(&doc.nodes, &ElementKind::Main);
843+ // The page is the root element: `<body>` is a column (the reset makes
844+ // it one, filling the viewport), `@page`'s styles are its class, and
845+ // the page's top-level elements are its children
846+ let root = Element {
847+ kind: ElementKind::El,
848+ attrs: page.styles.clone(),
849+ argument: None,
850+ children: Vec::new(),
851+ line_num: 0,
852+ function: None,
853+ };
854+ let mut own = Flow::of(&root);
855+ let top = Flow::default();
856+ let site = Site {
857+ kind: &root.kind,
858+ parent: &top,
859+ has_overlay_children: holds_overlays(&doc.nodes),
860+ inline: false,
861+ root: true,
862+ };
863+ let body_class = element_class(&root, &site, &mut styles);
864+ own.class = body_class.clone();
865+ ctx.flow = own;
729866
730867 let mut body = String::new();
868+ generate_children(
869+ &doc.nodes,
870+ Some(Layout::Column),
871+ &mut body,
872+ &mut styles,
873+ &mut ctx,
874+ );
875+
876+ let element_css = build_element_css(doc, &styles, dev);
877+ let nl = if dev { "\n" } else { "" };
878+
879+ let mut meta_html = String::new();
880+ // A `@meta viewport` of the page's own replaces the usual one
881+ if !doc.meta_tags.iter().any(|(name, _)| name == "viewport") {
882+ meta_html.push_str(&format!(
883+ "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">{}",
884+ nl
885+ ));
886+ }
887+ meta_html.push_str(&format!(
888+ "<title>{}</title>{}",
889+ html_escape(&page.title),
890+ nl
891+ ));
892+ for (name, content) in &doc.meta_tags {
893+ meta_html.push_str(&format!(
894+ "<meta name=\"{}\" content=\"{}\">{}",
895+ html_escape(name),
896+ html_escape(content),
897+ nl
898+ ));
899+ }
900+ for (property, content) in &doc.og_tags {
901+ meta_html.push_str(&format!(
902+ "<meta property=\"og:{}\" content=\"{}\">{}",
903+ html_escape(property),
904+ html_escape(content),
905+ nl
906+ ));
907+ }
908+ if let Some(path) = &page.favicon {
909+ meta_html.push_str(&format!(
910+ "<link rel=\"icon\" href=\"{}\">{}",
911+ html_escape(path),
912+ nl
913+ ));
914+ }
915+ for block in &doc.head_blocks {
916+ meta_html.push_str(block);
917+ meta_html.push_str(nl);
918+ }
731919
732− // Skip-to-content link for accessibility (only when @main exists)
733− if has_main {
920+ // `@page`'s HTML attributes go on `<html>`
921+ let mut root_attrs = String::new();
922+ for attr in html_attrs(&page.html_attrs) {
923+ push_html_attr(&mut root_attrs, attr);
924+ }
925+ let mut body_attrs = String::new();
926+ emit_class_attr(&mut body_attrs, body_class.as_deref(), None);
927+
928+ // Focus-visible CSS for interactive elements (accessibility)
929+ let focus_visible_css = if ctx.has_interactive {
930+ let focusable = ":where(a,button,input,select,textarea):focus-visible";
734931 if dev {
735− body.push_str("<a href=\"#hl-main\" class=\"hl-skip\">Skip to content</a>\n");
932+ format!(
933+ "{}{} {{ outline: 2px solid currentColor; outline-offset: 2px; }}\n",
934+ OWN_ELEMENTS, focusable
935+ )
736936 } else {
737− body.push_str("<a href=\"#hl-main\" class=\"hl-skip\">Skip to content</a>");
937+ format!(
938+ "{}{}{{outline:2px solid currentColor;outline-offset:2px}}",
939+ OWN_ELEMENTS, focusable
940+ )
738941 }
739− }
740−
741− for node in &doc.nodes {
742− generate_node(node, None, &mut body, &mut styles, &mut ctx);
743− }
942+ } else {
943+ String::new()
944+ };
945+ let reset_css = reset_css(dev, true, &focus_visible_css);
946+ classes.extend(styles.classes());
744947
745− // Collect external domains for DNS prefetch
746− let dns_prefetch_html = collect_dns_prefetch(&body, dev);
948+ format!(
949+ "<!DOCTYPE html>{nl}<html{root_attrs}>{nl}<head>{nl}<meta charset=\"utf-8\">{nl}\
950+ {meta_html}<style>{nl}{reset_css}{element_css}</style>{nl}</head>{nl}\
951+ <body{body_attrs}>{nl}{body}</body>{nl}</html>{nl}",
952+ )
953+}
747954
955+/// Assemble every CSS block the document needs (font faces, custom
956+/// properties, generated class rules, keyframes, and user CSS). Shared by
957+/// full-page and partial output so both emit the same styles.
958+fn build_element_css(doc: &Document, styles: &StyleCollector, dev: bool) -> String {
748959 let mut element_css = String::new();
749960
750− // CSS custom properties (includes @theme runtime tokens)
751− let has_theme_tokens = !doc.theme_tokens.is_empty();
752− if !doc.css_vars.is_empty() || has_theme_tokens {
961+ // Collect the CSS custom properties declared with `@let --name` so they
962+ // can be emitted in a single `:root` block below.
963+ let mut root_vars: Vec<(String, String)> = Vec::new();
964+ for (name, value) in &doc.css_vars {
965+ root_vars.push((name.clone(), value.clone()));
966+ }
967+
968+ // Generated rules always go in htmlang's layers, so unlayered user CSS
969+ // (`@style`, `@raw`) overrides them regardless of specificity.
970+ let styles_css = styles.to_css_formatted(dev, &doc.scoped_css);
971+
972+ // Emit the :root block first so the cascade picks up the custom
973+ // properties before the class rules consume them.
974+ if !root_vars.is_empty() {
753975 if dev {
754976 element_css.push_str(":root {\n");
755− for (name, value) in &doc.css_vars {
977+ for (name, value) in &root_vars {
756978 element_css.push_str(&format!(" {}: {};\n", name, value));
757979 }
758− // @theme tokens as runtime CSS custom properties
759− for (name, value) in &doc.theme_tokens {
760− let css_name = format!("--{}", name);
761− // Only emit if not already in css_vars
762− if !doc.css_vars.iter().any(|(n, _)| *n == css_name) {
763− element_css.push_str(&format!(" {}: {};\n", css_name, value));
764− }
765− }
766980 element_css.push_str("}\n");
767981 } else {
768982 element_css.push_str(":root{");
769− for (name, value) in &doc.css_vars {
983+ for (name, value) in &root_vars {
770984 element_css.push_str(name);
771985 element_css.push(':');
772986 element_css.push_str(value);
773987 element_css.push(';');
774988 }
775− for (name, value) in &doc.theme_tokens {
776− let css_name = format!("--{}", name);
777− if !doc.css_vars.iter().any(|(n, _)| *n == css_name) {
778− element_css.push_str(&css_name);
779− element_css.push(':');
780− element_css.push_str(value);
781− element_css.push(';');
782− }
783− }
784989 element_css.push('}');
785990 }
786991 }
787992
788− let has_custom_css = !doc.custom_css.is_empty();
789− let styles_css = styles.to_css_formatted(dev, !has_custom_css);
790− // Fold literal values declared via `@theme` / `@let --name` back into
791− // `var(--name)` references so the generated CSS actually uses the
792− // custom properties emitted in `:root`. Saves bytes and makes runtime
793− // theming take effect.
794− let styles_css = substitute_css_vars(&styles_css, &doc.css_vars);
795993 element_css.push_str(&styles_css);
796994
797− // @keyframes
798− for (name, kf_body) in &doc.keyframes {
995+ // @style blocks (custom CSS)
996+ for block in &doc.custom_css {
799997 if dev {
800− element_css.push_str(&format!("@keyframes {} {{\n{}\n}}\n", name, kf_body));
998+ element_css.push_str(block);
999+ element_css.push('\n');
8011000 } else {
802− element_css.push_str(&format!("@keyframes {}{{{}}}", name, kf_body));
1001+ element_css.push_str(&compact_css(block));
8031002 }
8041003 }
8051004
806− // Auto-inject skeleton keyframe if skeleton attribute is used
807− let skeleton_used = element_css.contains("hl-skeleton");
808− if skeleton_used {
809− if dev {
810− element_css.push_str("@keyframes hl-skeleton {\n 0% { background-position: 200% 0; }\n 100% { background-position: -200% 0; }\n}\n");
811− } else {
812− element_css.push_str("@keyframes hl-skeleton{0%{background-position:200% 0}100%{background-position:-200% 0}}");
813− }
814− }
815−
816− // Also inject carousel webkit scrollbar hiding
817− let carousel_used = element_css.contains("scroll-snap-type:x mandatory");
818− if carousel_used && !element_css.contains("::-webkit-scrollbar") {
819− // The carousel class already has scrollbar-width:none, but webkit needs pseudo-element
820− // We add a global rule for carousel-style elements
821− }
822−
823− // @style blocks (custom CSS)
824− for block in &doc.custom_css {
825− if dev {
826− element_css.push_str(block);
827− element_css.push('\n');
828− } else {
829− // Minify: collapse whitespace
830− let minified: String = block.lines().map(|l| l.trim()).collect::<Vec<_>>().join("");
831− element_css.push_str(&minified);
832− }
833− }
834−
835− // @scope blocks
836− for block in &doc.scope_blocks {
837− if dev {
838− element_css.push_str(block);
839− element_css.push('\n');
840− } else {
841− let minified: String = block.lines().map(|l| l.trim()).collect::<Vec<_>>().join("");
842− element_css.push_str(&minified);
843− }
844− }
845−
846− // @starting-style blocks
847− if !doc.starting_style_blocks.is_empty() {
848− if dev {
849− element_css.push_str("@starting-style {\n");
850− for block in &doc.starting_style_blocks {
851− element_css.push_str(block);
852− element_css.push('\n');
853− }
854− element_css.push_str("}\n");
855− } else {
856− element_css.push_str("@starting-style{");
857− for block in &doc.starting_style_blocks {
858− let minified: String = block.lines().map(|l| l.trim()).collect::<Vec<_>>().join("");
859− element_css.push_str(&minified);
860− }
861− element_css.push('}');
862− }
863− }
864−
865− // Build meta tags string
866− let meta_html = if doc.meta_tags.is_empty() {
867− String::new()
868− } else {
869− let mut m = String::new();
870− for (name, content) in &doc.meta_tags {
871− if dev {
872− m.push_str(&format!(
873− "<meta name=\"{}\" content=\"{}\">\n",
874− html_escape(name),
875− html_escape(content)
876− ));
877− } else {
878− m.push_str(&format!(
879− "<meta name=\"{}\" content=\"{}\">",
880− html_escape(name),
881− html_escape(content)
882− ));
883− }
884− }
885− m
886− };
887−
888− // Build OG meta tags
889− let og_html = if doc.og_tags.is_empty() {
890− String::new()
891− } else {
892− let mut o = String::new();
893− for (property, content) in &doc.og_tags {
894− if dev {
895− o.push_str(&format!(
896− "<meta property=\"og:{}\" content=\"{}\">\n",
897− html_escape(property),
898− html_escape(content)
899− ));
900− } else {
901− o.push_str(&format!(
902− "<meta property=\"og:{}\" content=\"{}\">",
903− html_escape(property),
904− html_escape(content)
905− ));
906− }
907− }
908− o
909− };
910−
911− // Build head blocks string
912− let head_html = if doc.head_blocks.is_empty() {
913− String::new()
914− } else {
915− let mut h = String::new();
916− for block in &doc.head_blocks {
917− h.push_str(block);
918− if dev {
919− h.push('\n');
920− }
921− }
922− h
923− };
924−
925− let lang_attr = match &doc.lang {
926− Some(lang) => format!(" lang=\"{}\"", html_escape(lang)),
927− None => String::new(),
928− };
929−
930− let favicon_html = match &doc.favicon {
931− Some(path) => {
932− // Try to read and inline the favicon
933− if let Ok(data) = std::fs::read(path) {
934− let mime = if path.ends_with(".ico") {
935− "image/x-icon"
936− } else if path.ends_with(".png") {
937− "image/png"
938− } else if path.ends_with(".svg") {
939− "image/svg+xml"
940− } else {
941− "image/x-icon"
942− };
943− let b64 = base64_encode(&data);
944− if dev {
945− format!(
946− "<link rel=\"icon\" href=\"data:{};base64,{}\">\n",
947− mime, b64
948− )
949− } else {
950− format!("<link rel=\"icon\" href=\"data:{};base64,{}\">", mime, b64)
951− }
952− } else {
953− // Fall back to href
954− if dev {
955− format!("<link rel=\"icon\" href=\"{}\">\n", html_escape(path))
956− } else {
957− format!("<link rel=\"icon\" href=\"{}\">", html_escape(path))
958− }
959− }
960− }
961− None => String::new(),
962− };
963−
964− // Canonical URL
965− let canonical_html = match &doc.canonical {
966− Some(url) => {
967− if dev {
968− format!("<link rel=\"canonical\" href=\"{}\">\n", html_escape(url))
969− } else {
970− format!("<link rel=\"canonical\" href=\"{}\">", html_escape(url))
971− }
972− }
973− None => String::new(),
974− };
1005+ element_css
1006+}
9751007
976− // Base URL
977− let base_html = match &doc.base_url {
978− Some(url) => {
979− if dev {
980− format!("<base href=\"{}\">\n", html_escape(url))
981− } else {
982− format!("<base href=\"{}\">", html_escape(url))
983− }
984− }
985− None => String::new(),
986− };
1008+/// An `@style` body on one line: each line trimmed, and the lines joined with
1009+/// a space, so a value that goes on over two lines (`margin: 0` then `auto;`)
1010+/// keeps its words apart.
1011+fn compact_css(block: &str) -> String {
1012+ block
1013+ .lines()
1014+ .map(str::trim)
1015+ .filter(|l| !l.is_empty())
1016+ .collect::<Vec<_>>()
1017+ .join(" ")
1018+}
9871019
988− // @font-face CSS
989− for (name, url) in &doc.font_faces {
990− let format_hint = if url.ends_with(".woff2") {
991− " format('woff2')"
992− } else if url.ends_with(".woff") {
993− " format('woff')"
994− } else if url.ends_with(".ttf") {
995− " format('truetype')"
996− } else if url.ends_with(".otf") {
997− " format('opentype')"
998− } else {
999− ""
1000− };
1001− if dev {
1002− element_css.insert_str(0, &format!(
1003− "@font-face {{\n font-family: '{}';\n src: url('{}'){};\n font-display: swap;\n}}\n",
1004− name, url, format_hint
1005− ));
1020+/// htmlang's own elements: those with a generated class, or the class of a
1021+/// function's scoped `@style`. The reset's rules for elements are kept to
1022+/// them, so `@raw` and `@markdown` content, and the page a fragment is put
1023+/// into, keep their own.
1024+const OWN_ELEMENTS: &str = ":where([class^=\"hl-\"],[class*=\" hl-\"])";
1025+
1026+/// htmlang's cascade layers, from the one that loses to the one that wins:
1027+/// the reset; the defaults of each element's kind (a heading's `margin:0`,
1028+/// a column's `display:flex`); the styles an element gets from an
1029+/// element prefix on an element around it (`@td:padding 8`) and from a
1030+/// function's scoped `@style`; and the element's own styles. So a
1031+/// scope's styles win over the defaults, and what an element says about
1032+/// itself wins over both. CSS outside any layer (`@style`, `@raw`) wins
1033+/// over all of them.
1034+const LAYERS: [&str; 4] = ["hl-reset", "hl-kind", "hl-inside", "htmlang"];
1035+
1036+/// Built-in reset rules, in a layer before `htmlang`: unlayered CSS beats
1037+/// every layer, so an unlayered rule here would override the generated
1038+/// ones. A page resets `box-sizing` everywhere and makes `<body>` a column
1039+/// that fills the window; a fragment, which goes into a page it doesn't
1040+/// own, touches only htmlang's own elements. In both, an element htmlang
1041+/// lays out stays hidden while it is `hidden`, a closed `<dialog>` or a
1042+/// popover that isn't showing: its generated `display` would otherwise
1043+/// beat the browser's `display: none`.
1044+fn reset_css(dev: bool, page: bool, focus_visible_css: &str) -> String {
1045+ let own = OWN_ELEMENTS;
1046+ let mut rules = Vec::new();
1047+ if page {
1048+ rules.push(if dev {
1049+ "*, *::before, *::after { box-sizing: border-box; }".to_string()
10061050 } else {
1007− element_css.insert_str(
1008− 0,
1009− &format!(
1010− "@font-face{{font-family:'{}';src:url('{}'){};font-display:swap}}",
1011− name, url, format_hint
1012− ),
1013− );
1014− }
1015− }
1016−
1017− // JSON-LD blocks
1018− let json_ld_html: String = doc
1019− .json_ld_blocks
1020− .iter()
1021− .map(|block| {
1022− if dev {
1023− format!(
1024− "<script type=\"application/ld+json\">\n{}\n</script>\n",
1025− block
1026− )
1027− } else {
1028− format!("<script type=\"application/ld+json\">{}</script>", block)
1029− }
1030− })
1031− .collect();
1032−
1033− // Manifest link
1034− let manifest_html = if let Some(ref manifest) = doc.manifest {
1035− let mut json = String::from("{");
1036− json.push_str(&format!("\"name\":\"{}\",", manifest.name));
1037− if let Some(ref short) = manifest.short_name {
1038− json.push_str(&format!("\"short_name\":\"{}\",", short));
1039− }
1040− json.push_str(&format!("\"start_url\":\"{}\",", manifest.start_url));
1041− json.push_str(&format!("\"display\":\"{}\"", manifest.display));
1042− if let Some(ref bg) = manifest.background_color {
1043− json.push_str(&format!(",\"background_color\":\"{}\"", bg));
1044− }
1045− if let Some(ref tc) = manifest.theme_color {
1046− json.push_str(&format!(",\"theme_color\":\"{}\"", tc));
1047− }
1048− if let Some(ref desc) = manifest.description {
1049− json.push_str(&format!(",\"description\":\"{}\"", desc));
1050− }
1051− if !manifest.icons.is_empty() {
1052− json.push_str(",\"icons\":[");
1053− for (i, (src, sizes)) in manifest.icons.iter().enumerate() {
1054− if i > 0 {
1055− json.push(',');
1056− }
1057− json.push_str(&format!(
1058− "{{\"src\":\"{}\",\"sizes\":\"{}\",\"type\":\"image/png\"}}",
1059− src, sizes
1060− ));
1061− }
1062− json.push(']');
1063− }
1064− json.push('}');
1065−
1066− // Inline the manifest as a data URI
1067− let encoded = base64_encode(json.as_bytes());
1068− if dev {
1069− format!(
1070− "<link rel=\"manifest\" href=\"data:application/manifest+json;base64,{}\">\n",
1071− encoded
1072− )
1051+ "*,*::before,*::after{box-sizing:border-box}".to_string()
1052+ });
1053+ rules.push(if dev {
1054+ "body { margin: 0; font-family: system-ui, -apple-system, sans-serif; display: flex; flex-direction: column; min-height: 100dvh; }".to_string()
10731055 } else {
1074− format!(
1075− "<link rel=\"manifest\" href=\"data:application/manifest+json;base64,{}\">",
1076− encoded
1077− )
1078− }
1056+ "body{margin:0;font-family:system-ui,-apple-system,sans-serif;display:flex;flex-direction:column;min-height:100dvh}".to_string()
1057+ });
10791058 } else {
1080− String::new()
1081− };
1082−
1083− // Preload hints (auto-detect fonts from @font-face)
1084− let mut preload_html = String::new();
1085− for (_, url) in &doc.font_faces {
1086− if dev {
1087− preload_html.push_str(&format!(
1088− "<link rel=\"preload\" href=\"{}\" as=\"font\" type=\"font/woff2\" crossorigin>\n",
1089− url
1090− ));
1091− } else {
1092− preload_html.push_str(&format!(
1093− "<link rel=\"preload\" href=\"{}\" as=\"font\" type=\"font/woff2\" crossorigin>",
1094− url
1095− ));
1096− }
1097− }
1098− // Explicit preload hints from the document
1099− for hint in &doc.preload_hints {
1100− if dev {
1101− preload_html.push_str(&format!(
1102− "<link rel=\"preload\" href=\"{}\" as=\"{}\"{}>\n",
1103− html_escape(&hint.href),
1104− hint.as_type,
1105− if hint.crossorigin { " crossorigin" } else { "" }
1106− ));
1059+ rules.push(if dev {
1060+ format!("{own}, {own}::before, {own}::after {{ box-sizing: border-box; }}")
11071061 } else {
1108− preload_html.push_str(&format!(
1109− "<link rel=\"preload\" href=\"{}\" as=\"{}\"{}>",
1110− html_escape(&hint.href),
1111− hint.as_type,
1112− if hint.crossorigin { " crossorigin" } else { "" }
1113− ));
1114− }
1062+ format!("{own},{own}::before,{own}::after{{box-sizing:border-box}}")
1063+ });
11151064 }
1116−
1117− // Auto theme-color meta from @theme primary token
1118− let theme_color_html = doc
1119− .theme_tokens
1120− .iter()
1121− .find(|(name, _)| name == "primary" || name == "theme-color")
1122− .map(|(_, value)| {
1123− if dev {
1124− format!(
1125− "<meta name=\"theme-color\" content=\"{}\">\n",
1126− html_escape(value)
1127− )
1128− } else {
1129− format!(
1130− "<meta name=\"theme-color\" content=\"{}\">",
1131− html_escape(value)
1132− )
1133− }
1134− })
1135− .unwrap_or_default();
1136−
1137− // Focus-visible CSS for interactive elements (accessibility)
1138− let focus_visible_css = if ctx.has_interactive {
1139− if dev {
1140− "a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 2px solid currentColor; outline-offset: 2px; }\n"
1141− } else {
1142− "a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid currentColor;outline-offset:2px}"
1143− }
1144− } else {
1145− ""
1146− };
1147−
1148− // Skip-to-content CSS (visually hidden but accessible)
1149− let skip_link_css = if has_main {
1150− if dev {
1151− ".hl-skip { position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden; z-index: 9999; padding: 8px 16px; background: #000; color: #fff; text-decoration: none; font-size: 14px; }\n.hl-skip:focus { left: 8px; top: 8px; width: auto; height: auto; overflow: visible; }\n"
1152− } else {
1153− ".hl-skip{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden;z-index:9999;padding:8px 16px;background:#000;color:#fff;text-decoration:none;font-size:14px}.hl-skip:focus{left:8px;top:8px;width:auto;height:auto;overflow:visible}"
1154− }
1065+ let hidden = "[hidden]:not([hidden=\"until-found\"]),dialog:not([open]):not(:popover-open),\
1066+ [popover]:not(:popover-open):not(dialog[open])";
1067+ rules.push(if dev {
1068+ format!("{own}:where({hidden}) {{ display: none !important; }}")
11551069 } else {
1156− ""
1157− };
1158−
1159− // Noscript fallback: show deferred content if JS is disabled
1160− let noscript_html = if ctx.has_defer {
1161− if dev {
1162− "<noscript><style>.hl-defer-placeholder { display: none; }</style></noscript>\n"
1163− } else {
1164− "<noscript><style>.hl-defer-placeholder{display:none}</style></noscript>"
1165− }
1070+ format!("{own}:where({hidden}){{display:none!important}}")
1071+ });
1072+ let mut rules = rules.join(if dev { "\n" } else { "" });
1073+ if dev {
1074+ rules.push('\n');
1075+ }
1076+ rules.push_str(focus_visible_css);
1077+ if dev {
1078+ format!(
1079+ "@layer {};\n@layer hl-reset {{\n{}}}\n",
1080+ LAYERS.join(", "),
1081+ rules
1082+ )
11661083 } else {
1167− ""
1168− };
1169−
1170− match &doc.page_title {
1171− Some(title) => {
1172− if dev {
1173− format!(
1174− "\
1175−<!DOCTYPE html>
1176−<html{lang_attr}>
1177−<head>
1178−<meta charset=\"utf-8\">
1179−<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">
1180−<title>{title}</title>
1181−{theme_color_html}{base_html}{canonical_html}{manifest_html}{preload_html}{dns_prefetch_html}{meta_html}{og_html}{favicon_html}{json_ld_html}{head_html}\
1182−<style>
1183−*, *::before, *::after {{ box-sizing: border-box; }}
1184−body {{ margin: 0; font-family: system-ui, -apple-system, sans-serif; }}
1185−img {{ display: block; }}
1186−{focus_visible_css}{skip_link_css}{element_css}\
1187−</style>
1188−{noscript_html}\
1189−</head>
1190−<body>
1191−{body}\
1192−</body>
1193−</html>
1194−",
1195− title = html_escape(title),
1196− lang_attr = lang_attr,
1197− theme_color_html = theme_color_html,
1198− base_html = base_html,
1199− canonical_html = canonical_html,
1200− manifest_html = manifest_html,
1201− preload_html = preload_html,
1202− dns_prefetch_html = dns_prefetch_html,
1203− meta_html = meta_html,
1204− favicon_html = favicon_html,
1205− json_ld_html = json_ld_html,
1206− head_html = head_html,
1207− og_html = og_html,
1208− focus_visible_css = focus_visible_css,
1209− skip_link_css = skip_link_css,
1210− noscript_html = noscript_html,
1211− element_css = element_css,
1212− body = body,
1213− )
1214− } else {
1215− format!(
1216− "<!DOCTYPE html><html{lang_attr}><head><meta charset=\"utf-8\"><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\"><title>{title}</title>{theme_color_html}{base_html}{canonical_html}{manifest_html}{preload_html}{dns_prefetch_html}{meta_html}{og_html}{favicon_html}{json_ld_html}{head_html}<style>*,*::before,*::after{{box-sizing:border-box}}body{{margin:0;font-family:system-ui,-apple-system,sans-serif}}img{{display:block}}{focus_visible_css}{skip_link_css}{element_css}</style>{noscript_html}</head><body>{body}</body></html>",
1217− title = html_escape(title),
1218− lang_attr = lang_attr,
1219− theme_color_html = theme_color_html,
1220− base_html = base_html,
1221− canonical_html = canonical_html,
1222− manifest_html = manifest_html,
1223− preload_html = preload_html,
1224− dns_prefetch_html = dns_prefetch_html,
1225− meta_html = meta_html,
1226− og_html = og_html,
1227− favicon_html = favicon_html,
1228− json_ld_html = json_ld_html,
1229− head_html = head_html,
1230− focus_visible_css = focus_visible_css,
1231− skip_link_css = skip_link_css,
1232− noscript_html = noscript_html,
1233− element_css = element_css,
1234− body = body,
1235− )
1236− }
1237− }
1238− None => {
1239− if element_css.is_empty() {
1240− body
1241− } else if dev {
1242− format!("<style>\n{}</style>\n{}", element_css, body)
1243− } else {
1244− format!("<style>{}</style>{}", element_css, body)
1245− }
1246− }
1084+ format!("@layer {};@layer hl-reset{{{}}}", LAYERS.join(","), rules)
12471085 }
12481086}
12491087
12501088/// Generate an HTML fragment: body + optional <style>, no <html>/<head>/<body> wrapper.
1251−fn generate_partial_inner(doc: &Document, dev: bool) -> String {
1089+fn generate_partial_inner(doc: &Document, dev: bool, classes: &mut Vec<Class>) -> String {
12521090 let mut styles = StyleCollector::new();
12531091 let mut ctx = GenContext {
12541092 dev,
12551093 depth: 0,
1256− image_count: 0,
12571094 has_interactive: false,
1258− has_defer: false,
1095+ in_text: false,
1096+ flow: Flow::default(),
1097+ in_picture: false,
12591098 };
12601099 let mut body = String::new();
12611100
1262− for node in &doc.nodes {
1263− generate_node(node, None, &mut body, &mut styles, &mut ctx);
1264− }
1265−
1266− let has_custom_css = !doc.custom_css.is_empty();
1267− let mut element_css = String::new();
1268−
1269− // CSS custom properties
1270− if !doc.css_vars.is_empty() || !doc.theme_tokens.is_empty() {
1271− if dev {
1272− element_css.push_str(":root {\n");
1273− for (name, value) in &doc.css_vars {
1274− element_css.push_str(&format!(" {}: {};\n", name, value));
1275− }
1276− for (name, value) in &doc.theme_tokens {
1277− let css_name = format!("--{}", name);
1278− if !doc.css_vars.iter().any(|(n, _)| *n == css_name) {
1279− element_css.push_str(&format!(" {}: {};\n", css_name, value));
1280− }
1281− }
1282− element_css.push_str("}\n");
1283− } else {
1284− element_css.push_str(":root{");
1285− for (name, value) in &doc.css_vars {
1286− element_css.push_str(name);
1287− element_css.push(':');
1288− element_css.push_str(value);
1289− element_css.push(';');
1290− }
1291− for (name, value) in &doc.theme_tokens {
1292− let css_name = format!("--{}", name);
1293− if !doc.css_vars.iter().any(|(n, _)| *n == css_name) {
1294− element_css.push_str(&css_name);
1295− element_css.push(':');
1296− element_css.push_str(value);
1297− element_css.push(';');
1298− }
1299− }
1300− element_css.push('}');
1301− }
1302− }
1303−
1304− let styles_css = styles.to_css_formatted(dev, !has_custom_css);
1305− let styles_css = substitute_css_vars(&styles_css, &doc.css_vars);
1306− element_css.push_str(&styles_css);
1307−
1308− for (name, kf_body) in &doc.keyframes {
1309− if dev {
1310− element_css.push_str(&format!("@keyframes {} {{\n{}\n}}\n", name, kf_body));
1311− } else {
1312− element_css.push_str(&format!("@keyframes {}{{{}}}", name, kf_body));
1313− }
1314− }
1101+ generate_children(&doc.nodes, None, &mut body, &mut styles, &mut ctx);
13151102
1316− for block in &doc.custom_css {
1317− if dev {
1318− element_css.push_str(block);
1319− element_css.push('\n');
1320− } else {
1321− let minified: String = block.lines().map(|l| l.trim()).collect::<Vec<_>>().join("");
1322− element_css.push_str(&minified);
1323− }
1103+ let mut element_css = build_element_css(doc, &styles, dev);
1104+ // htmlang's own elements get the reset's rules for elements (which
1105+ // also puts htmlang's layers in order)
1106+ if !styles.entries.is_empty() || !doc.scoped_css.is_empty() {
1107+ element_css.insert_str(0, &reset_css(dev, false, ""));
13241108 }
1109+ classes.extend(styles.classes());
13251110
13261111 if element_css.is_empty() {
13271112 body
@@ -1336,44 +1121,20 @@ fn generate_partial_inner(doc: &Document, dev: bool) -> String {
13361121// Node generation
13371122// ---------------------------------------------------------------------------
13381123
1124+/// Write `node`, which is inside an element with the layout `parent`
1125+/// (`None` at the top of the page).
13391126fn generate_node(
13401127 node: &Node,
1341− parent_kind: Option<&ElementKind>,
1128+ parent: Option<Layout>,
13421129 out: &mut String,
13431130 styles: &mut StyleCollector,
13441131 ctx: &mut GenContext,
13451132) {
13461133 match node {
1347− Node::Element(elem) => generate_element(elem, parent_kind, out, styles, ctx),
1134+ Node::Element(elem) => generate_element(elem, parent, out, styles, ctx),
13481135 Node::Text(segments) => {
1349− let needs_wrap = matches!(
1350− parent_kind,
1351− Some(ElementKind::Row)
1352− | Some(ElementKind::Column)
1353− | Some(ElementKind::El)
1354− | Some(ElementKind::Nav)
1355− | Some(ElementKind::Header)
1356− | Some(ElementKind::Footer)
1357− | Some(ElementKind::Main)
1358− | Some(ElementKind::Section)
1359− | Some(ElementKind::Article)
1360− | Some(ElementKind::Aside)
1361− | Some(ElementKind::ListItem)
1362− | Some(ElementKind::Form)
1363− | Some(ElementKind::Details)
1364− | Some(ElementKind::Figure)
1365− | Some(ElementKind::Blockquote)
1366− | Some(ElementKind::Dialog)
1367− | Some(ElementKind::DefinitionList)
1368− | Some(ElementKind::DefinitionDescription)
1369− | Some(ElementKind::Fieldset)
1370− | Some(ElementKind::Datalist)
1371− | Some(ElementKind::Grid)
1372− | Some(ElementKind::Stack)
1373− | Some(ElementKind::Noscript)
1374− | Some(ElementKind::Address)
1375− | Some(ElementKind::Search)
1376− );
1136+ // In a row, column or grid each line of text is a child
1137+ let needs_wrap = parent.is_some_and(Layout::is_container);
13771138 if needs_wrap {
13781139 out.push_str(&ctx.indent());
13791140 out.push_str("<span>");
@@ -1392,195 +1153,191 @@ fn generate_node(
13921153 }
13931154}
13941155
1395−/// HTML attributes that are passed through to the HTML tag rather than converted to CSS.
1396−const HTML_PASSTHROUGH_ATTRS: &[&str] = &[
1397− "type",
1398− "placeholder",
1399− "name",
1400− "value",
1401− "disabled",
1402− "required",
1403− "checked",
1404− "for",
1405− "action",
1406− "method",
1407− "autocomplete",
1408− "min",
1409− "max",
1410− "step",
1411− "pattern",
1412− "maxlength",
1413− "rows",
1414− "cols",
1415− "multiple",
1416− "alt",
1417− "role",
1418− "tabindex",
1419− "title",
1420− "autofocus",
1421− // Media
1422− "controls",
1423− "autoplay",
1424− "loop",
1425− "muted",
1426− "poster",
1427− "preload",
1428− // Image optimization
1429− "loading",
1430− "decoding",
1431− // Media src (explicit attribute form)
1432− "src",
1433− // New element attributes
1434− "datetime",
1435− "media",
1436− "sizes",
1437− "srcset",
1438− "list",
1439− // Details
1440− "open",
1441− // Form
1442− "novalidate",
1443− // Progress/Meter
1444− "low",
1445− "high",
1446− "optimum",
1447− // Table
1448− "colspan",
1449− "rowspan",
1450− "scope",
1451− // Popover API
1452− "popover",
1453− "popovertarget",
1454− "popovertargetaction",
1455− // Modern form/input hints
1456− "inputmode",
1457− "enterkeyhint",
1458− // Performance hints
1459− "fetchpriority",
1460− "blocking",
1461− // Global attrs
1462− "translate",
1463− "spellcheck",
1464− // ARIA live regions
1465− "aria-live",
1466− "aria-atomic",
1467− "aria-relevant",
1468−];
1156+/// What goes between two things written one after the other in an element
1157+/// with this layout (`None`: the top of the page): text flows, so its lines
1158+/// and children are joined with a space; in HTML's own layout, and at the
1159+/// top of the page, two lines of text are separated by a line break (a
1160+/// space, except where whitespace is kept, as in `@pre`).
1161+fn separator(layout: Option<Layout>, previous_is_text: bool, next: &Node) -> Option<char> {
1162+ match layout {
1163+ Some(Layout::Text) => Some(' '),
1164+ Some(Layout::Native) | None if previous_is_text && matches!(next, Node::Text(_)) => {
1165+ Some('\n')
1166+ }
1167+ _ => None,
1168+ }
1169+}
14691170
1470−/// Boolean HTML attributes (rendered without a value, e.g., `<input disabled>`).
1471−const BOOLEAN_HTML_ATTRS: &[&str] = &[
1472− "disabled",
1473− "required",
1474− "checked",
1475− "multiple",
1476− "controls",
1477− "autoplay",
1478− "loop",
1479− "muted",
1480− "open",
1481− "novalidate",
1482− "autofocus",
1483− "defer",
1484− "async",
1485− "nomodule",
1486− // Popover
1487− "popover",
1488−];
1171+/// Write the children of an element (or of a `@fragment`, which has no
1172+/// element of its own) laid out as `layout` (`None`: the top of the page).
1173+/// The first line of an element's text is its first child.
1174+fn generate_children(
1175+ children: &[Node],
1176+ layout: Option<Layout>,
1177+ out: &mut String,
1178+ styles: &mut StyleCollector,
1179+ ctx: &mut GenContext,
1180+) {
1181+ generate_run(children, layout, &mut None, out, styles, ctx);
1182+}
14891183
1490−fn emit_html_passthrough_attrs(out: &mut String, attrs: &[Attribute]) {
1491− for attr in attrs {
1492− let key = attr.key.as_str();
1493− let is_passthrough = HTML_PASSTHROUGH_ATTRS.contains(&key)
1494− || key.starts_with("aria-")
1495− || key.starts_with("data-");
1496− if !is_passthrough {
1184+/// [`generate_children`], with `previous` saying whether what was written
1185+/// last was a line of text (`None`: nothing yet). A `@fragment`'s children
1186+/// are written as if they stood in its place, so its lines are separated
1187+/// from the lines around it like any other lines.
1188+fn generate_run(
1189+ children: &[Node],
1190+ layout: Option<Layout>,
1191+ previous: &mut Option<bool>,
1192+ out: &mut String,
1193+ styles: &mut StyleCollector,
1194+ ctx: &mut GenContext,
1195+) {
1196+ for child in children {
1197+ if let Node::Element(elem) = child
1198+ && elem.kind == ElementKind::Fragment
1199+ {
1200+ generate_run(&elem.children, layout, previous, out, styles, ctx);
14971201 continue;
14981202 }
1499− if BOOLEAN_HTML_ATTRS.contains(&key) && attr.value.is_none() {
1500− out.push(' ');
1501− out.push_str(key);
1502− } else if let Some(val) = &attr.value {
1503− out.push(' ');
1504− out.push_str(key);
1505− out.push_str("=\"");
1506− out.push_str(&html_escape(strip_string_quotes(val)));
1507− out.push('"');
1203+ let start = out.len();
1204+ if let Some(previous_is_text) = *previous
1205+ && let Some(sep) = separator(layout, previous_is_text, child)
1206+ {
1207+ out.push(sep);
1208+ }
1209+ let body = out.len();
1210+ generate_node(child, layout, out, styles, ctx);
1211+ // A child that writes nothing (an empty `@fragment`) takes no
1212+ // separator either, so text never gets two spaces in a row
1213+ if out.len() == body {
1214+ out.truncate(start);
1215+ continue;
15081216 }
1217+ *previous = Some(matches!(child, Node::Text(_)));
15091218 }
15101219}
15111220
1512−/// If the value is wrapped in a single pair of matching quotes (e.g.
1513−/// `"Avatar"`), return the inner content. Quotes act as source-level
1514−/// delimiters in the `.hl` syntax and shouldn't leak into HTML attribute
1515−/// values. Multi-quoted values like `"h h" "s m"` are left unchanged —
1516−/// those are real string tokens (used e.g. by CSS `grid-template-areas`).
1517−fn strip_string_quotes(val: &str) -> &str {
1518− let bytes = val.as_bytes();
1519− if bytes.len() < 2 {
1520− return val;
1521− }
1522− let first = bytes[0];
1523− let last = bytes[bytes.len() - 1];
1524− if (first == b'"' && last == b'"') || (first == b'\'' && last == b'\'') {
1525− let inner = &val[1..val.len() - 1];
1526− if !inner.as_bytes().contains(&first) {
1527− return inner;
1221+/// Emit the element's leading argument as its attribute (`@iframe URL` →
1222+/// `src="URL"`, `@form /submit` → `action="/submit"`, `@link /a` →
1223+/// `href="/a"`), first, before the class. `@image [inline] photo.png` puts
1224+/// the file itself into the page.
1225+fn emit_argument_attr(out: &mut String, elem: &Element, in_picture: bool) {
1226+ let (Some(attr), Some(value)) = (elem.kind.leading_attribute(in_picture), &elem.argument)
1227+ else {
1228+ return;
1229+ };
1230+ // `@image [inline]`'s file is already a `data:` URI (see the parser)
1231+ let value = html_escape(value);
1232+ out.push(' ');
1233+ out.push_str(attr);
1234+ out.push_str("=\"");
1235+ out.push_str(&value);
1236+ out.push('"');
1237+}
1238+
1239+/// A file's bytes as a `data:` URI, its type from its extension.
1240+pub(crate) fn data_uri(path: &str, data: &[u8]) -> String {
1241+ let mime = match path
1242+ .rsplit('.')
1243+ .next()
1244+ .map(str::to_ascii_lowercase)
1245+ .as_deref()
1246+ {
1247+ Some("png") => "image/png",
1248+ Some("jpg" | "jpeg") => "image/jpeg",
1249+ Some("gif") => "image/gif",
1250+ Some("webp") => "image/webp",
1251+ Some("avif") => "image/avif",
1252+ Some("svg") => "image/svg+xml",
1253+ Some("ico") => "image/x-icon",
1254+ _ => "application/octet-stream",
1255+ };
1256+ format!("data:{};base64,{}", mime, base64_encode(data))
1257+}
1258+
1259+/// Emit HTML attributes: `key=value` ones (except `id` / `class`, which
1260+/// are emitted with the generated class) and flags like `required`.
1261+fn emit_html_attrs(out: &mut String, attrs: &[Attribute]) {
1262+ for attr in html_attrs(attrs) {
1263+ let key = attr.key.as_str();
1264+ if key != "id" && key != "class" {
1265+ push_html_attr(out, attr);
15281266 }
15291267 }
1530− val
1268+}
1269+
1270+/// The HTML attributes of `attrs`, `key=value` ones and flags, each name
1271+/// once: the later one wins, as a style does. (Of two attributes with one
1272+/// name, the browser keeps the first, so a bundle's attribute or a
1273+/// function's own would win over one written after it.)
1274+fn html_attrs(attrs: &[Attribute]) -> impl Iterator<Item = &Attribute> {
1275+ let is_html =
1276+ |a: &Attribute| a.html || (a.value.is_none() && crate::vocab::is_html_flag(&a.key));
1277+ attrs.iter().enumerate().filter_map(move |(i, attr)| {
1278+ let later = attrs[i + 1..]
1279+ .iter()
1280+ .any(|other| is_html(other) && other.key == attr.key);
1281+ (is_html(attr) && !later).then_some(attr)
1282+ })
1283+}
1284+
1285+/// ` key="value"`, or ` key` for a flag.
1286+fn push_html_attr(out: &mut String, attr: &Attribute) {
1287+ out.push(' ');
1288+ out.push_str(&attr.key);
1289+ if attr.html {
1290+ out.push_str("=\"");
1291+ // Quoted text has already lost its quotes (see parser.rs)
1292+ out.push_str(&html_escape(attr.value.as_deref().unwrap_or("")));
1293+ out.push('"');
1294+ }
1295+}
1296+
1297+// True if any direct child is `@in-front` or `@behind`. Such children render
1298+// as absolutely positioned overlays, so the parent automatically becomes a
1299+// positioning context (position:relative + isolation:isolate).
1300+fn has_overlay_children(elem: &Element) -> bool {
1301+ holds_overlays(&elem.children)
1302+}
1303+
1304+fn holds_overlays(children: &[Node]) -> bool {
1305+ children.iter().any(|child| {
1306+ matches!(
1307+ child,
1308+ Node::Element(e) if e.kind.is_tag("in-front") || e.kind.is_tag("behind")
1309+ )
1310+ })
15311311}
15321312
15331313fn generate_element(
15341314 elem: &Element,
1535− parent_kind: Option<&ElementKind>,
1315+ parent: Option<Layout>,
15361316 out: &mut String,
15371317 styles: &mut StyleCollector,
15381318 ctx: &mut GenContext,
15391319) {
15401320 // Self-closing elements
1541− if matches!(
1542− elem.kind,
1543− ElementKind::Image
1544− | ElementKind::Input
1545− | ElementKind::HorizontalRule
1546− | ElementKind::Source
1547− | ElementKind::Spacer
1548− ) {
1549− generate_self_closing(elem, parent_kind, out, styles, ctx);
1321+ if elem.kind.layout() == Layout::Void {
1322+ generate_self_closing(elem, parent, out, styles, ctx);
15501323 return;
15511324 }
1552− // @script renders as <script> with raw body content (no HTML escaping)
1553− if elem.kind == ElementKind::Script {
1325+ // A verbatim element (@script) writes its body as it is, with no HTML
1326+ // escaping; it isn't shown, so it has no class (its styles are an error)
1327+ if elem.kind.is_verbatim() {
1328+ let tag = elem.kind.spec().map_or("script", |spec| spec.html);
15541329 out.push_str(&ctx.indent());
1555− out.push_str("<script");
1556− // Pass through src, type, defer, async, etc.
1557− for attr in &elem.attrs {
1558− let key = attr.key.as_str();
1559− if matches!(
1560− key,
1561− "src"
1562− | "type"
1563− | "defer"
1564− | "async"
1565− | "crossorigin"
1566− | "integrity"
1567− | "nomodule"
1568− | "id"
1569− ) {
1570− if let Some(val) = &attr.value {
1571− out.push(' ');
1572− out.push_str(key);
1573− out.push_str("=\"");
1574− out.push_str(&html_escape(val));
1575− out.push('"');
1576− } else {
1577− out.push(' ');
1578− out.push_str(key);
1579− }
1330+ out.push('<');
1331+ out.push_str(tag);
1332+ emit_argument_attr(out, elem, false);
1333+ let (id, class) = extract_id_class(&elem.attrs);
1334+ for (key, value) in [("id", id), ("class", class)] {
1335+ if let Some(value) = value {
1336+ out.push_str(&format!(" {}=\"{}\"", key, html_escape(&value)));
15801337 }
15811338 }
1339+ emit_html_attrs(out, &elem.attrs);
15821340 out.push('>');
1583− // Children are raw JS code, not HTML
15841341 for child in &elem.children {
15851342 match child {
15861343 Node::Text(segments) => {
@@ -1594,46 +1351,10 @@ fn generate_element(
15941351 _ => {}
15951352 }
15961353 }
1597− out.push_str("</script>");
1598− out.push_str(ctx.nl());
1599− return;
1600− }
1601− // @breadcrumb generates semantic <nav aria-label="breadcrumb"><ol>...</ol></nav>
1602− if elem.kind == ElementKind::Breadcrumb {
1603− let gen_class = compute_class(&elem.attrs, &elem.kind, parent_kind, styles);
1604− let (id, user_class) = extract_id_class(&elem.attrs);
1605− out.push_str(&ctx.indent());
1606− out.push_str("<nav aria-label=\"breadcrumb\"");
1607− emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
1608− if let Some(id) = id {
1609− out.push_str(" id=\"");
1610− out.push_str(&html_escape(&id));
1611− out.push('"');
1612− }
1354+ out.push_str("</");
1355+ out.push_str(tag);
16131356 out.push('>');
16141357 out.push_str(ctx.nl());
1615− ctx.depth += 1;
1616− out.push_str(&ctx.indent());
1617− out.push_str("<ol>");
1618− out.push_str(ctx.nl());
1619− ctx.depth += 1;
1620− for child in &elem.children {
1621− out.push_str(&ctx.indent());
1622− out.push_str("<li>");
1623− let mut buf = String::new();
1624− generate_node(child, Some(&elem.kind), &mut buf, styles, ctx);
1625− out.push_str(buf.trim());
1626− out.push_str("</li>");
1627− out.push_str(ctx.nl());
1628− }
1629− ctx.depth -= 1;
1630− out.push_str(&ctx.indent());
1631− out.push_str("</ol>");
1632− out.push_str(ctx.nl());
1633− ctx.depth -= 1;
1634− out.push_str(&ctx.indent());
1635− out.push_str("</nav>");
1636− out.push_str(ctx.nl());
16371358 return;
16381359 }
16391360 if elem.kind == ElementKind::Children {
@@ -1643,185 +1364,38 @@ fn generate_element(
16431364 return;
16441365 }
16451366 if elem.kind == ElementKind::Fragment {
1646− // Render children without a wrapper element
1647− for child in &elem.children {
1648− generate_node(child, parent_kind, out, styles, ctx);
1649− }
1367+ // Render children without a wrapper element, as if they were
1368+ // written where the fragment is
1369+ generate_children(&elem.children, parent, out, styles, ctx);
16501370 return;
16511371 }
16521372
1373+ let mut own = Flow::of(elem);
16531374 let tag = match &elem.kind {
1654− ElementKind::Row
1655− | ElementKind::Column
1656− | ElementKind::El
1657− | ElementKind::Grid
1658− | ElementKind::Stack => "div",
1375+ ElementKind::Row | ElementKind::El => "div",
16591376 ElementKind::Text => "span",
16601377 ElementKind::Paragraph => "p",
16611378 ElementKind::Link => "a",
1662− ElementKind::Button => "button",
1663− ElementKind::Select => "select",
1664− ElementKind::Textarea => "textarea",
1665− ElementKind::Option => "option",
1666− ElementKind::Label => "label",
1667− // Semantic elements
1668− ElementKind::Nav => "nav",
1669− ElementKind::Header => "header",
1670− ElementKind::Footer => "footer",
1671− ElementKind::Main => "main",
1672− ElementKind::Section => "section",
1673− ElementKind::Article => "article",
1674− ElementKind::Aside => "aside",
1675− // List
1676− ElementKind::List => {
1677− if elem.attrs.iter().any(|a| a.key == "ordered") {
1678− "ol"
1679− } else {
1680− "ul"
1681− }
1682− }
1683− ElementKind::ListItem => "li",
1684− // Table
1685− ElementKind::Table => "table",
1686− ElementKind::TableHead => "thead",
1687− ElementKind::TableBody => "tbody",
1688− ElementKind::TableRow => "tr",
1689− ElementKind::TableCell => "td",
1690− ElementKind::TableHeaderCell => "th",
1691− // Media
1692− ElementKind::Video => "video",
1693− ElementKind::Audio => "audio",
1694− // Additional semantic elements
1695− ElementKind::Form => "form",
1696− ElementKind::Details => "details",
1697− ElementKind::Summary => "summary",
1698− ElementKind::Blockquote => "blockquote",
1699− ElementKind::Cite => "cite",
1700− ElementKind::Code => "code",
1701− ElementKind::Pre => "pre",
1702− ElementKind::Figure => "figure",
1703− ElementKind::FigCaption => "figcaption",
1704− ElementKind::Progress => "progress",
1705− ElementKind::Meter => "meter",
1706− // New elements
1707− ElementKind::Dialog => "dialog",
1708− ElementKind::DefinitionList => "dl",
1709− ElementKind::DefinitionTerm => "dt",
1710− ElementKind::DefinitionDescription => "dd",
1711− ElementKind::Fieldset => "fieldset",
1712− ElementKind::Legend => "legend",
1713− ElementKind::Picture => "picture",
1714− ElementKind::Time => "time",
1715− ElementKind::Mark => "mark",
1716− ElementKind::Kbd => "kbd",
1717− ElementKind::Abbr => "abbr",
1718− ElementKind::Datalist => "datalist",
1719− ElementKind::Iframe => "iframe",
1720− ElementKind::Output => "output",
1721− ElementKind::Canvas => "canvas",
1722− ElementKind::Badge => "span",
1723− ElementKind::Tooltip => "span",
1724− ElementKind::Avatar => "div",
1725− ElementKind::Carousel => "div",
1726− ElementKind::Chip => "span",
1727− ElementKind::Tag => "span",
1728− ElementKind::Noscript => "noscript",
1729− ElementKind::Address => "address",
1730− ElementKind::Search => "search",
1731− ElementKind::Image
1732− | ElementKind::Input
1733− | ElementKind::HorizontalRule
1734− | ElementKind::Children
1735− | ElementKind::Slot(_)
1736− | ElementKind::Fragment
1737− | ElementKind::Source
1738− | ElementKind::Spacer
1739− | ElementKind::Script
1740− | ElementKind::Breadcrumb => unreachable!(),
1741− };
1742−
1743− let kind_label = match elem.kind {
1744− ElementKind::Row => "row",
1745− ElementKind::Column => "column",
1746− ElementKind::El => "el",
1747− ElementKind::Text => "text",
1748− ElementKind::Paragraph => "paragraph",
1749− ElementKind::Link => "link",
1750− ElementKind::Button => "button",
1751− ElementKind::Select => "select",
1752− ElementKind::Textarea => "textarea",
1753− ElementKind::Option => "option",
1754− ElementKind::Label => "label",
1755− ElementKind::Nav => "nav",
1756− ElementKind::Header => "header",
1757− ElementKind::Footer => "footer",
1758− ElementKind::Main => "main",
1759− ElementKind::Section => "section",
1760− ElementKind::Article => "article",
1761− ElementKind::Aside => "aside",
1762− ElementKind::List => "list",
1763− ElementKind::ListItem => "item",
1764− ElementKind::Table => "table",
1765− ElementKind::TableHead => "thead",
1766− ElementKind::TableBody => "tbody",
1767− ElementKind::TableRow => "tr",
1768− ElementKind::TableCell => "td",
1769− ElementKind::TableHeaderCell => "th",
1770− ElementKind::Video => "video",
1771− ElementKind::Audio => "audio",
1772− ElementKind::Form => "form",
1773− ElementKind::Details => "details",
1774− ElementKind::Summary => "summary",
1775− ElementKind::Blockquote => "blockquote",
1776− ElementKind::Cite => "cite",
1777− ElementKind::Code => "code",
1778− ElementKind::Pre => "pre",
1779− ElementKind::Figure => "figure",
1780− ElementKind::FigCaption => "figcaption",
1781− ElementKind::Fragment => "fragment",
1782− ElementKind::Dialog => "dialog",
1783− ElementKind::DefinitionList => "dl",
1784− ElementKind::DefinitionTerm => "dt",
1785− ElementKind::DefinitionDescription => "dd",
1786− ElementKind::Fieldset => "fieldset",
1787− ElementKind::Legend => "legend",
1788− ElementKind::Picture => "picture",
1789− ElementKind::Time => "time",
1790− ElementKind::Mark => "mark",
1791− ElementKind::Kbd => "kbd",
1792− ElementKind::Abbr => "abbr",
1793− ElementKind::Datalist => "datalist",
1794− ElementKind::Iframe => "iframe",
1795− ElementKind::Output => "output",
1796− ElementKind::Canvas => "canvas",
1797− ElementKind::Grid => "grid",
1798− ElementKind::Stack => "stack",
1799− ElementKind::Badge => "badge",
1800− ElementKind::Tooltip => "tooltip",
1801− ElementKind::Avatar => "avatar",
1802− ElementKind::Carousel => "carousel",
1803− ElementKind::Chip => "chip",
1804− ElementKind::Tag => "tag",
1805− ElementKind::Noscript => "noscript",
1806− ElementKind::Address => "address",
1807− ElementKind::Search => "search",
1379+ ElementKind::Tag(spec) => spec.html,
18081380 _ => "",
18091381 };
1382+ // Inside text, htmlang's own `<div>` is a `<span>`, which text can
1383+ // hold (directly in text, a row, column or grid is also laid out
1384+ // inline: see `Site::inline`)
1385+ let in_text = ctx.in_text || parent == Some(Layout::Text);
1386+ let tag = if in_text && tag == "div" { "span" } else { tag };
1387+ let kind_label = elem.kind.name();
18101388
18111389 // Track interactive elements for focus-visible CSS
1812− if matches!(
1813− elem.kind,
1814− ElementKind::Link
1815− | ElementKind::Button
1816− | ElementKind::Input
1817− | ElementKind::Select
1818− | ElementKind::Textarea
1819− ) {
1390+ if elem.kind == ElementKind::Link
1391+ || matches!(kind_label, "button" | "input" | "select" | "textarea")
1392+ {
18201393 ctx.has_interactive = true;
18211394 }
18221395
18231396 // Compute CSS for each state and get a class name
1824− let gen_class = compute_class(&elem.attrs, &elem.kind, parent_kind, styles);
1397+ let gen_class = element_class(elem, &Site::new(elem, parent, &ctx.flow), styles);
1398+ own.class = gen_class.clone();
18251399 let (id, user_class) = extract_id_class(&elem.attrs);
18261400
18271401 if ctx.dev && elem.line_num > 0 {
@@ -1835,85 +1409,9 @@ fn generate_element(
18351409 out.push('<');
18361410 out.push_str(tag);
18371411
1838− // @main gets id="hl-main" for skip-to-content link (unless user set an id)
1839− if elem.kind == ElementKind::Main && id.is_none() {
1840− out.push_str(" id=\"hl-main\"");
1841− }
1412+ emit_argument_attr(out, elem, ctx.in_picture);
18421413
1843− if elem.kind == ElementKind::Link
1844− && let Some(url) = &elem.argument
1845− {
1846− out.push_str(" href=\"");
1847− out.push_str(&html_escape(url));
1848− out.push('"');
1849− // Auto rel="noopener noreferrer" and target="_blank" for external links
1850− let is_external = url.starts_with("http://") || url.starts_with("https://");
1851− if is_external {
1852− let has_rel = elem.attrs.iter().any(|a| a.key == "rel");
1853− let has_target = elem.attrs.iter().any(|a| a.key == "target");
1854− if !has_rel {
1855− out.push_str(" rel=\"noopener noreferrer\"");
1856− }
1857− if !has_target {
1858− out.push_str(" target=\"_blank\"");
1859− }
1860− }
1861− }
1862−
1863− // Video/Audio src
1864− if matches!(elem.kind, ElementKind::Video | ElementKind::Audio)
1865− && let Some(src) = &elem.argument
1866− {
1867− out.push_str(" src=\"");
1868− out.push_str(&html_escape(src));
1869− out.push('"');
1870− }
1871−
1872− // Form action
1873− if elem.kind == ElementKind::Form
1874− && let Some(action) = &elem.argument
1875− {
1876− out.push_str(" action=\"");
1877− out.push_str(&html_escape(action));
1878− out.push('"');
1879− }
1880−
1881− // Iframe src
1882− if elem.kind == ElementKind::Iframe
1883− && let Some(src) = &elem.argument
1884− {
1885− out.push_str(" src=\"");
1886− out.push_str(&html_escape(src));
1887− out.push('"');
1888− }
1889−
1890− // Tooltip title
1891− if elem.kind == ElementKind::Tooltip
1892− && let Some(text) = &elem.argument
1893− {
1894− out.push_str(" title=\"");
1895− out.push_str(&html_escape(text));
1896− out.push('"');
1897− }
1898−
1899− // Critical CSS: inline styles directly instead of using a class
1900− let is_critical = elem.attrs.iter().any(|a| a.key == "critical");
1901− if is_critical {
1902− let inline_css = attrs_to_css(&elem.attrs, "", &elem.kind, parent_kind);
1903− if !inline_css.is_empty() {
1904− out.push_str(" style=\"");
1905− out.push_str(&html_escape(&inline_css));
1906− out.push('"');
1907− }
1908− // Still use class for non-base styles (pseudo, responsive, etc.)
1909− if gen_class.as_deref().is_some_and(|c| !c.is_empty()) {
1910− emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
1911− } else if let Some(ref uc) = user_class {
1912− emit_class_attr(out, None, Some(uc));
1913− }
1914− } else {
1915− emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
1916− }
1414+ emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
19171415
19181416 if let Some(id) = id {
19191417 out.push_str(" id=\"");
@@ -1921,7 +1419,7 @@ fn generate_element(
19211419 out.push('"');
19221420 }
19231421
1924− emit_html_passthrough_attrs(out, &elem.attrs);
1422+ emit_html_attrs(out, &elem.attrs);
19251423
19261424 // Source map attributes in dev mode
19271425 if ctx.dev && elem.line_num > 0 {
@@ -1932,51 +1430,27 @@ fn generate_element(
19321430 }
19331431
19341432 out.push('>');
1433+ // In `<pre>` and `<textarea>` every space and line break shows, so
1434+ // readable (dev) output adds none there: a code sample's lines stay
1435+ // exactly as written
1436+ let outer_dev = ctx.dev;
1437+ ctx.dev &= !matches!(tag, "pre" | "textarea");
19351438 out.push_str(ctx.nl());
19361439
1937− // Inline text argument
1938− if matches!(
1939− elem.kind,
1940− ElementKind::Text
1941− | ElementKind::Button
1942− | ElementKind::Label
1943− | ElementKind::Option
1944− | ElementKind::Textarea
1945− | ElementKind::ListItem
1946− | ElementKind::TableCell
1947− | ElementKind::TableHeaderCell
1948− | ElementKind::Summary
1949− | ElementKind::Cite
1950− | ElementKind::Code
1951− | ElementKind::FigCaption
1952− | ElementKind::Legend
1953− | ElementKind::DefinitionTerm
1954− | ElementKind::Mark
1955− | ElementKind::Kbd
1956− | ElementKind::Abbr
1957− | ElementKind::Time
1958− | ElementKind::DefinitionDescription
1959− | ElementKind::Badge
1960− | ElementKind::Tooltip
1961− | ElementKind::Chip
1962− | ElementKind::Tag
1963− ) && let Some(text) = &elem.argument
1964− {
1965− out.push_str(&html_escape(text));
1966− }
1967−
1968− // Children
1440+ let layout = elem.kind.layout();
19691441 ctx.depth += 1;
1970− let is_paragraph = elem.kind == ElementKind::Paragraph;
1971− for (i, child) in elem.children.iter().enumerate() {
1972− generate_node(child, Some(&elem.kind), out, styles, ctx);
1973− if is_paragraph && i < elem.children.len() - 1 {
1974− out.push(' ');
1975− }
1976− }
1442+ let outer_in_text = ctx.in_text;
1443+ ctx.in_text = in_text || layout == Layout::Text;
1444+ let outer_flow = std::mem::replace(&mut ctx.flow, own);
1445+ let outer_picture = std::mem::replace(&mut ctx.in_picture, elem.kind.is_tag("picture"));
1446+ generate_children(&elem.children, Some(layout), out, styles, ctx);
1447+ ctx.in_picture = outer_picture;
1448+ ctx.flow = outer_flow;
1449+ ctx.in_text = outer_in_text;
19771450 ctx.depth -= 1;
19781451
19791452 out.push_str(&ctx.indent());
1453+ ctx.dev = outer_dev;
19801454 out.push_str("</");
19811455 out.push_str(tag);
19821456 out.push('>');
@@ -1985,21 +1459,18 @@ fn generate_element(
19851459
19861460fn generate_self_closing(
19871461 elem: &Element,
1988− parent_kind: Option<&ElementKind>,
1462+ parent: Option<Layout>,
19891463 out: &mut String,
19901464 styles: &mut StyleCollector,
19911465 ctx: &mut GenContext,
19921466) {
1993− let gen_class = compute_class(&elem.attrs, &elem.kind, parent_kind, styles);
1467+ let gen_class = element_class(elem, &Site::new(elem, parent, &ctx.flow), styles);
19941468 let (id, user_class) = extract_id_class(&elem.attrs);
19951469
1996− let (tag, kind_label) = match elem.kind {
1470+ let (tag, kind_label) = match &elem.kind {
19971471 ElementKind::Image => ("img", "image"),
1998− ElementKind::Input => ("input", "input"),
1999− ElementKind::HorizontalRule => ("hr", "hr"),
2000− ElementKind::Source => ("source", "source"),
2001− ElementKind::Spacer => ("div", "spacer"),
2002− _ => unreachable!(),
1472+ ElementKind::Tag(spec) => (spec.html, spec.name),
1473+ _ => unreachable!("not a void element: {:?}", elem.kind),
20031474 };
20041475
20051476 if ctx.dev && elem.line_num > 0 {
@@ -2012,43 +1483,7 @@ fn generate_self_closing(
20121483 out.push_str(&ctx.indent());
20131484 out.push('<');
20141485 out.push_str(tag);
2015−
2016− // Image src (with optional non-SVG base64 inlining)
2017− if elem.kind == ElementKind::Image {
2018− let src = elem.argument.as_deref().unwrap_or("");
2019− let is_inline = elem.attrs.iter().any(|a| a.key == "inline");
2020− if is_inline && !src.is_empty() && !src.ends_with(".svg") {
2021− let mime = if src.ends_with(".png") {
2022− "image/png"
2023− } else if src.ends_with(".jpg") || src.ends_with(".jpeg") {
2024− "image/jpeg"
2025− } else if src.ends_with(".gif") {
2026− "image/gif"
2027− } else if src.ends_with(".webp") {
2028− "image/webp"
2029− } else if src.ends_with(".avif") {
2030− "image/avif"
2031− } else {
2032− "application/octet-stream"
2033− };
2034− if let Ok(data) = std::fs::read(src) {
2035− let b64 = base64_encode(&data);
2036− out.push_str(" src=\"data:");
2037− out.push_str(mime);
2038− out.push_str(";base64,");
2039− out.push_str(&b64);
2040− out.push('"');
2041− } else {
2042− out.push_str(" src=\"");
2043− out.push_str(&html_escape(src));
2044− out.push('"');
2045− }
2046− } else {
2047− out.push_str(" src=\"");
2048− out.push_str(&html_escape(src));
2049− out.push('"');
2050− }
2051− }
1486+ emit_argument_attr(out, elem, ctx.in_picture);
20521487
20531488 emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
20541489
@@ -2058,7 +1493,7 @@ fn generate_self_closing(
20581493 out.push('"');
20591494 }
20601495
2061− emit_html_passthrough_attrs(out, &elem.attrs);
1496+ emit_html_attrs(out, &elem.attrs);
20621497
20631498 // Source map attributes in dev mode (self-closing)
20641499 if ctx.dev && elem.line_num > 0 {
@@ -2068,93 +1503,6 @@ fn generate_self_closing(
20681503 ));
20691504 }
20701505
2071− // Image optimization: auto-add loading="lazy" and decoding="async"
2072− if elem.kind == ElementKind::Image {
2073− // SVG inlining: @image [inline] logo.svg
2074− if elem.attrs.iter().any(|a| a.key == "inline")
2075− && let Some(src) = &elem.argument
2076− && src.ends_with(".svg")
2077− && let Ok(svg_content) = std::fs::read_to_string(src)
2078− {
2079− // Close the tag we opened, then emit inline SVG instead
2080− out.truncate(out.rfind('<').unwrap_or(0));
2081− out.push_str(&ctx.indent());
2082− out.push_str(svg_content.trim());
2083− out.push_str(ctx.nl());
2084− return;
2085− }
2086− // Responsive srcset: @image photo.jpg [responsive 400 800 1200]
2087− let responsive_attr = elem.attrs.iter().find(|a| a.key == "responsive");
2088− if let Some(resp) = responsive_attr
2089− && let Some(ref sizes_str) = resp.value
2090− {
2091− let widths: Vec<&str> = sizes_str.split_whitespace().collect();
2092− if !widths.is_empty() {
2093− let src = elem.argument.as_deref().unwrap_or("");
2094− if !src.is_empty() {
2095− // Generate srcset with width descriptors
2096− // Convention: file-{width}.ext (e.g., photo-400.jpg)
2097− let dot_pos = src.rfind('.').unwrap_or(src.len());
2098− let base = &src[..dot_pos];
2099− let ext = &src[dot_pos..];
2100− let mut srcset_parts = Vec::new();
2101− for w in &widths {
2102− srcset_parts.push(format!("{}-{}{} {}w", base, w, ext, w));
2103− }
2104− out.push_str(" srcset=\"");
2105− out.push_str(&srcset_parts.join(", "));
2106− out.push('"');
2107− // Generate sizes attribute
2108− let max_width = widths.last().unwrap_or(&"100vw");
2109− out.push_str(&format!(
2110− " sizes=\"(max-width: {}px) 100vw, {}px\"",
2111− max_width, max_width
2112− ));
2113− }
2114− }
2115− }
2116−
2117− // Auto image dimensions: read local image file to inject width/height + aspect-ratio
2118− let has_width = elem.attrs.iter().any(|a| a.key == "width");
2119− let has_height = elem.attrs.iter().any(|a| a.key == "height");
2120− if (!has_width || !has_height)
2121− && let Some(ref src) = elem.argument
2122− && !src.starts_with("http://")
2123− && !src.starts_with("https://")
2124− && !src.starts_with("data:")
2125− && let Some((w, h)) = read_image_dimensions(src)
2126− {
2127− if !has_width {
2128− out.push_str(&format!(" width=\"{}\"", w));
2129− }
2130− if !has_height {
2131− out.push_str(&format!(" height=\"{}\"", h));
2132− }
2133− // Auto aspect-ratio to prevent CLS
2134− if !elem.attrs.iter().any(|a| a.key == "aspect-ratio") {
2135− out.push_str(&format!(" style=\"aspect-ratio:{}/{}\"", w, h));
2136− }
2137− }
2138−
2139− // Smart image loading: first 3 images get fetchpriority="high" (above the fold),
2140− // subsequent images get loading="lazy" + decoding="async"
2141− ctx.image_count += 1;
2142− if ctx.image_count <= 3 {
2143− // Above-the-fold: eager loading with high priority
2144− if !elem.attrs.iter().any(|a| a.key == "fetchpriority") {
2145− out.push_str(" fetchpriority=\"high\"");
2146− }
2147− } else {
2148− // Below-the-fold: lazy loading
2149− if !elem.attrs.iter().any(|a| a.key == "loading") {
2150− out.push_str(" loading=\"lazy\"");
2151− }
2152− if !elem.attrs.iter().any(|a| a.key == "decoding") {
2153− out.push_str(" decoding=\"async\"");
2154− }
2155− }
2156− }
2157−
21581506 out.push('>');
21591507 out.push_str(ctx.nl());
21601508}
@@ -2170,7 +1518,10 @@ fn generate_text_segments(
21701518 TextSegment::Plain(text) => out.push_str(&html_escape(text)),
21711519 TextSegment::Inline(elem) => {
21721520 let mut buf = String::new();
2173− generate_element(elem, None, &mut buf, styles, ctx);
1521+ // An element inside a line of text is in text
1522+ let outer_flow = std::mem::take(&mut ctx.flow);
1523+ generate_element(elem, Some(Layout::Text), &mut buf, styles, ctx);
1524+ ctx.flow = outer_flow;
21741525 out.push_str(buf.trim_end());
21751526 }
21761527 }
@@ -2183,141 +1534,97 @@ fn generate_text_segments(
21831534
21841535fn compute_class(
21851536 attrs: &[Attribute],
2186− kind: &ElementKind,
2187− parent_kind: Option<&ElementKind>,
1537+ site: &Site,
21881538 styles: &mut StyleCollector,
1539+ distinct: String,
21891540) -> Option<String> {
2190− let base = attrs_to_css(attrs, "", kind, parent_kind);
2191−
2192− // Collect pseudo-state overrides
2193− let mut pseudo = Vec::new();
2194− for &(prefix, selector) in PSEUDO_PREFIXES {
2195− let css = attrs_to_css(attrs, prefix, kind, parent_kind);
2196− if !css.is_empty() {
2197− pseudo.push((selector.to_string(), css));
2198− }
2199− }
2200−
2201− // Auto-add ::-webkit-scrollbar pseudo for no-scrollbar attribute
2202− if attrs.iter().any(|a| a.key == "no-scrollbar") {
2203− pseudo.push((
2204− "::-webkit-scrollbar".to_string(),
2205− "display:none;".to_string(),
2206− ));
2207− }
2208−
2209− // Collect nth:EXPR: dynamic pseudo selectors
2210− let mut nth_prefixes: Vec<String> = Vec::new();
2211− for attr in attrs {
2212− if attr.key.starts_with("nth:") {
2213− let rest = &attr.key[4..];
2214− if let Some(colon_pos) = rest.find(':') {
2215− let prefix = format!("nth:{}:", &rest[..colon_pos]);
2216− if !nth_prefixes.contains(&prefix) {
2217− nth_prefixes.push(prefix);
2218− }
2219− }
2220− }
2221− }
2222− for prefix in &nth_prefixes {
2223− let expr = &prefix[4..prefix.len() - 1];
2224− let selector = format!(":nth-child({})", expr);
2225− let css = attrs_to_css(attrs, prefix, kind, parent_kind);
2226− if !css.is_empty() {
2227− pseudo.push((selector, css));
1541+ // Every condition an attribute is under, and none
1542+ let mut conditions = vec![Condition::default()];
1543+ for attr in attrs.iter().filter(|a| !a.html) {
1544+ let (condition, _) = Condition::of(&attr.key);
1545+ if !conditions.contains(&condition) {
1546+ conditions.push(condition);
22281547 }
22291548 }
1549+ // Dedupe: if a property is declared twice within a single rule, keep only
1550+ // the last occurrence.
1551+ let rules: Vec<(Condition, String)> = conditions
1552+ .into_iter()
1553+ .map(|condition| {
1554+ let css = dedupe_declarations(&attrs_to_css(attrs, &condition, site));
1555+ (condition, css)
1556+ })
1557+ .collect();
1558+ // The kind's defaults, less what the element sets itself (a user
1559+ // `[list-style disc]` wins over the default `list-style:none` anyway,
1560+ // so there is no need to ship both)
1561+ let own = rules
1562+ .iter()
1563+ .find(|(condition, _)| *condition == Condition::default())
1564+ .map_or("", |(_, css)| css.as_str());
1565+ let own: Vec<&str> = declarations(own).map(|(name, _)| name).collect();
1566+ let defaults: String = declarations(&dedupe_declarations(&default_css(site)))
1567+ .filter(|(name, _)| !own.contains(name))
1568+ .map(|(_, declaration)| declaration)
1569+ .collect();
1570+ styles.get_class(defaults, rules, distinct)
1571+}
22301572
2231− // Collect has(...): dynamic pseudo selectors
2232− let mut has_prefixes: Vec<String> = Vec::new();
2233− for attr in attrs {
2234− if attr.key.starts_with("has(")
2235− && let Some(close) = attr.key.find("):")
2236− {
2237− let prefix = format!("{}:", &attr.key[..close + 1]);
2238− if !has_prefixes.contains(&prefix) {
2239− has_prefixes.push(prefix);
2240− }
2241− }
1573+/// The defaults of an element's kind where it is: an overlay's positioning
1574+/// context, its layout, and its kind's own CSS (a heading's `margin:0`).
1575+fn default_css(site: &Site) -> String {
1576+ let mut css = String::new();
1577+ // Elements with @in-front / @behind children become positioning
1578+ // contexts
1579+ if site.has_overlay_children {
1580+ css.push_str("position:relative;isolation:isolate;");
22421581 }
2243− for prefix in &has_prefixes {
2244− let inner = &prefix[4..prefix.len() - 2]; // extract selector from has(selector):
2245− let selector = format!(":has({})", inner);
2246− let css = attrs_to_css(attrs, prefix, kind, parent_kind);
2247− if !css.is_empty() {
2248− pseudo.push((selector, css));
2249− }
1582+ if !site.root {
1583+ css.push_str(layout_css(site.kind.layout(), site.inline));
22501584 }
1585+ css.push_str(site.kind.css());
1586+ css
1587+}
22511588
2252− // Collect responsive overrides
2253− let mut responsive = Vec::new();
2254− for &(bp_name, _) in BREAKPOINTS {
2255− let prefix = format!("{}:", bp_name);
2256− let css = attrs_to_css(attrs, &prefix, kind, parent_kind);
2257− if !css.is_empty() {
2258− responsive.push((bp_name.to_string(), css));
1589+/// The declarations of a rule body, as (property, `property:value;`), for
1590+/// bodies htmlang wrote: every declaration ends in `;`, and a `;` inside
1591+/// quotes or parentheses doesn't end one.
1592+fn declarations(css: &str) -> impl Iterator<Item = (&str, &str)> {
1593+ let mut rest = css;
1594+ std::iter::from_fn(move || {
1595+ if rest.is_empty() {
1596+ return None;
22591597 }
2260− }
2261−
2262− // Collect container query overrides
2263− let mut container = Vec::new();
2264− for &(bp_name, _) in BREAKPOINTS {
2265− let prefix = format!("cq-{}:", bp_name);
2266− let css = attrs_to_css(attrs, &prefix, kind, parent_kind);
2267− if !css.is_empty() {
2268− container.push((bp_name.to_string(), css));
1598+ let (mut depth, mut quote, mut escaped) = (0i32, None, false);
1599+ let mut end = rest.len();
1600+ for (i, c) in rest.char_indices() {
1601+ match c {
1602+ _ if escaped => escaped = false,
1603+ '\\' => escaped = true,
1604+ c if Some(c) == quote => quote = None,
1605+ _ if quote.is_some() => {}
1606+ '"' | '\'' => quote = Some(c),
1607+ '(' => depth += 1,
1608+ ')' => depth -= 1,
1609+ ';' if depth == 0 => {
1610+ end = i + 1;
1611+ break;
1612+ }
1613+ _ => {}
1614+ }
22691615 }
2270− }
2271−
2272− let dark = attrs_to_css(attrs, "dark:", kind, parent_kind);
2273− let print = attrs_to_css(attrs, "print:", kind, parent_kind);
2274− let motion_safe = attrs_to_css(attrs, "motion-safe:", kind, parent_kind);
2275− let motion_reduce = attrs_to_css(attrs, "motion-reduce:", kind, parent_kind);
2276− let landscape = attrs_to_css(attrs, "landscape:", kind, parent_kind);
2277− let portrait = attrs_to_css(attrs, "portrait:", kind, parent_kind);
2278−
2279− // Dedupe: if a property is declared twice within a single rule, keep only
2280− // the last occurrence (element-kind defaults are written before
2281− // user attributes, so a user [list-style disc] correctly overrides the
2282− // default list-style:none, and we don't need to ship both).
2283− let base = dedupe_declarations(&base);
2284− let pseudo: Vec<(String, String)> = pseudo
2285− .into_iter()
2286− .map(|(sel, css)| (sel, dedupe_declarations(&css)))
2287− .collect();
2288− let responsive: Vec<(String, String)> = responsive
2289− .into_iter()
2290− .map(|(bp, css)| (bp, dedupe_declarations(&css)))
2291− .collect();
2292− let dark = dedupe_declarations(&dark);
2293− let print = dedupe_declarations(&print);
2294− let motion_safe = dedupe_declarations(&motion_safe);
2295− let motion_reduce = dedupe_declarations(&motion_reduce);
2296− let landscape = dedupe_declarations(&landscape);
2297− let portrait = dedupe_declarations(&portrait);
2298− let container: Vec<(String, String)> = container
2299− .into_iter()
2300− .map(|(bp, css)| (bp, dedupe_declarations(&css)))
2301− .collect();
2302−
2303− styles.get_class(
2304− base,
2305− pseudo,
2306− responsive,
2307− dark,
2308− print,
2309− motion_safe,
2310− motion_reduce,
2311− landscape,
2312− portrait,
2313− container,
2314− )
1616+ let (declaration, after) = rest.split_at(end);
1617+ rest = after;
1618+ let name = declaration.split(':').next().unwrap_or("").trim();
1619+ Some((name, declaration))
1620+ })
23151621}
23161622
23171623/// Dedupe CSS declarations within a single rule body: for any property
23181624/// declared more than once, keep only the last occurrence. Unparseable
2319−/// segments (no `:`) are preserved as-is. Semicolons inside parentheses are
2320−/// treated as part of a value, not as declaration separators.
1625+/// segments (no `:`) are preserved as-is. Semicolons inside parentheses or
1626+/// quoted strings are treated as part of a value, not as declaration
1627+/// separators.
23211628fn dedupe_declarations(css: &str) -> String {
23221629 if css.is_empty() {
23231630 return String::new();
@@ -2332,1592 +1639,700 @@ fn dedupe_declarations(css: &str) -> String {
23321639 let mut decls: Vec<(Option<String>, String)> = Vec::new();
23331640 let mut current = String::new();
23341641 let mut depth: i32 = 0;
1642+ // A quoted string's `;` (`content "a;b"`) is text; a backslash escapes
1643+ // the character after it
1644+ let mut quote: Option<char> = None;
1645+ let mut escaped = false;
23351646 for ch in css.chars() {
2336− if ch == '(' {
2337− depth += 1;
1647+ if escaped {
1648+ escaped = false;
23381649 current.push(ch);
2339− } else if ch == ')' {
2340− depth -= 1;
1650+ } else if ch == '\\' {
1651+ escaped = true;
23411652 current.push(ch);
2342− } else if ch == ';' && depth == 0 {
2343− current.push(';');
2344− let trimmed = current.trim();
2345− if !trimmed.is_empty() && trimmed != ";" {
2346− let prop = trimmed
2347− .trim_end_matches(';')
2348− .split_once(':')
2349− .map(|(p, _)| p.trim().to_ascii_lowercase());
2350− decls.push((prop, std::mem::take(&mut current)));
2351− } else {
2352− current.clear();
1653+ } else if let Some(q) = quote {
1654+ if ch == q {
1655+ quote = None;
23531656 }
2354− } else {
23551657 current.push(ch);
2356− }
2357− }
2358− if !current.trim().is_empty() {
2359− let prop = current
2360− .split_once(':')
2361− .map(|(p, _)| p.trim().to_ascii_lowercase());
2362− decls.push((prop, std::mem::take(&mut current)));
2363− }
2364−
2365− if decls.len() < 2 {
2366− return css.to_string();
2367− }
2368−
2369− // Find index of last occurrence of each property.
2370− use std::collections::HashMap;
2371− let mut last: HashMap<String, usize> = HashMap::new();
2372− for (i, (prop, _)) in decls.iter().enumerate() {
2373− if let Some(p) = prop {
2374− last.insert(p.clone(), i);
2375− }
2376− }
2377−
2378− let mut out = String::with_capacity(css.len());
2379− for (i, (prop, raw)) in decls.iter().enumerate() {
2380− let keep = match prop {
2381− Some(p) => last.get(p) == Some(&i),
2382− None => true,
2383− };
2384− if keep {
2385− out.push_str(raw);
2386− }
2387− }
2388− out
2389−}
2390−
2391−fn emit_class_attr(out: &mut String, gen_class: Option<&str>, user_class: Option<&str>) {
2392− match (gen_class, user_class) {
2393− (Some(g), Some(u)) => {
2394− out.push_str(" class=\"");
2395− out.push_str(g);
2396− out.push(' ');
2397− out.push_str(&html_escape(u));
2398− out.push('"');
2399− }
2400− (Some(g), None) => {
2401− out.push_str(" class=\"");
2402− out.push_str(g);
2403− out.push('"');
2404− }
2405− (None, Some(u)) => {
2406− out.push_str(" class=\"");
2407− out.push_str(&html_escape(u));
2408− out.push('"');
2409− }
2410− (None, None) => {}
2411− }
2412−}
2413−
2414−// ---------------------------------------------------------------------------
2415−// Attribute → CSS mapping
2416−// ---------------------------------------------------------------------------
2417−
2418−/// (htmlang prefix, CSS selector suffix)
2419−const PSEUDO_PREFIXES: &[(&str, &str)] = &[
2420− ("hover:", ":hover"),
2421− ("active:", ":active"),
2422− ("focus:", ":focus"),
2423− ("focus-visible:", ":focus-visible"),
2424− ("focus-within:", ":focus-within"),
2425− ("disabled:", ":disabled"),
2426− ("checked:", ":checked"),
2427− ("placeholder:", "::placeholder"),
2428− ("first:", ":first-child"),
2429− ("last:", ":last-child"),
2430− ("odd:", ":nth-child(odd)"),
2431− ("even:", ":nth-child(even)"),
2432− ("before:", "::before"),
2433− ("after:", "::after"),
2434− ("selection:", "::selection"),
2435− ("visited:", ":visited"),
2436− ("empty:", ":empty"),
2437− ("target:", ":target"),
2438− ("valid:", ":valid"),
2439− ("invalid:", ":invalid"),
2440−];
2441−const RESPONSIVE_PREFIXES: &[&str] = &["sm:", "md:", "lg:", "xl:", "2xl:"];
2442−const MEDIA_PREFIXES: &[&str] = &[
2443− "dark:",
2444− "print:",
2445− "motion-safe:",
2446− "motion-reduce:",
2447− "landscape:",
2448− "portrait:",
2449−];
2450−const CONTAINER_QUERY_PREFIXES: &[&str] = &["cq-sm:", "cq-md:", "cq-lg:", "cq-xl:", "cq-2xl:"];
2451−
2452−fn is_prefixed_attr(key: &str) -> bool {
2453− PSEUDO_PREFIXES.iter().any(|&(p, _)| key.starts_with(p))
2454− || RESPONSIVE_PREFIXES.iter().any(|p| key.starts_with(p))
2455− || MEDIA_PREFIXES.iter().any(|p| key.starts_with(p))
2456− || CONTAINER_QUERY_PREFIXES.iter().any(|p| key.starts_with(p))
2457− || key.starts_with("nth:")
2458− || key.starts_with("has(")
2459−}
2460−
2461−fn attrs_to_css(
2462− attrs: &[Attribute],
2463− state_prefix: &str,
2464− kind: &ElementKind,
2465− parent_kind: Option<&ElementKind>,
2466−) -> String {
2467− let mut css = String::new();
2468−
2469− // Base element styles only for the default (non-state) pass
2470− if state_prefix.is_empty() {
2471− match kind {
2472− ElementKind::Row => css.push_str("display:flex;flex-direction:row;"),
2473− ElementKind::Column => css.push_str("display:flex;flex-direction:column;"),
2474− ElementKind::El => css.push_str("display:flex;flex-direction:column;"),
2475− ElementKind::Paragraph => css.push_str("margin:0;"),
2476− // Semantic elements get flex column layout like @el
2477− ElementKind::Nav | ElementKind::Header | ElementKind::Footer
2478− | ElementKind::Main | ElementKind::Section | ElementKind::Article
2479− | ElementKind::Aside => css.push_str("display:flex;flex-direction:column;"),
2480− // Lists: reset browser defaults
2481− ElementKind::List => css.push_str("margin:0;padding-left:0;list-style:none;"),
2482− ElementKind::ListItem => css.push_str("display:flex;flex-direction:column;"),
2483− // Form: flex column like @el
2484− ElementKind::Form => css.push_str("display:flex;flex-direction:column;"),
2485− // Details: flex column
2486− ElementKind::Details => css.push_str("display:flex;flex-direction:column;"),
2487− // Figure: flex column
2488− ElementKind::Figure => css.push_str("display:flex;flex-direction:column;margin:0;"),
2489− // Blockquote: flex column, reset browser margin
2490− ElementKind::Blockquote => css.push_str("display:flex;flex-direction:column;margin:0;"),
2491− // Pre: preserve whitespace
2492− ElementKind::Pre => css.push_str("margin:0;white-space:pre;font-family:ui-monospace,monospace;"),
2493− // Code: monospace font
2494− ElementKind::Code => css.push_str("font-family:ui-monospace,monospace;"),
2495− // New elements
2496− ElementKind::Dialog => css.push_str("display:flex;flex-direction:column;"),
2497− ElementKind::DefinitionList => css.push_str("margin:0;"),
2498− ElementKind::DefinitionDescription => css.push_str("margin:0;display:flex;flex-direction:column;"),
2499− ElementKind::Fieldset => css.push_str("display:flex;flex-direction:column;border:1px solid currentColor;padding:0.5em;margin:0;"),
2500− ElementKind::Kbd => css.push_str("font-family:ui-monospace,monospace;"),
2501− ElementKind::Grid => css.push_str("display:grid;"),
2502− ElementKind::Stack => css.push_str("position:relative;"),
2503− ElementKind::Badge => css.push_str("display:inline-flex;align-items:center;justify-content:center;padding:2px 8px;border-radius:9999px;font-size:0.75rem;font-weight:600;line-height:1;"),
2504− ElementKind::Tooltip => css.push_str("position:relative;cursor:help;"),
2505− ElementKind::Spacer => css.push_str("flex:1;"),
2506− ElementKind::Avatar => css.push_str("display:inline-flex;align-items:center;justify-content:center;border-radius:9999px;overflow:hidden;flex-shrink:0;"),
2507− ElementKind::Carousel => css.push_str("display:flex;flex-direction:row;overflow-x:auto;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;scrollbar-width:none;"),
2508− ElementKind::Chip => css.push_str("display:inline-flex;align-items:center;gap:4px;padding:4px 12px;border-radius:9999px;font-size:0.875rem;border:1px solid currentColor;"),
2509− ElementKind::Tag => css.push_str("display:inline-flex;align-items:center;padding:2px 8px;border-radius:4px;font-size:0.75rem;font-weight:600;"),
2510− _ => {}
2511− }
2512− // Children of @carousel get scroll-snap-align and flex-shrink
2513− if matches!(parent_kind, Some(ElementKind::Carousel)) {
2514− css.push_str("scroll-snap-align:start;flex-shrink:0;");
2515− }
2516− }
2517−
2518− for attr in attrs {
2519− // Determine the effective key for this pass
2520− let effective_key = if state_prefix.is_empty() {
2521− if is_prefixed_attr(&attr.key) {
2522− continue;
2523− }
2524− attr.key.as_str()
2525− } else {
2526− match attr.key.strip_prefix(state_prefix) {
2527− Some(k) => k,
2528− None => continue,
2529− }
2530− };
2531−
2532− let val = attr.value.as_deref();
2533−
2534− match effective_key {
2535− // Layout
2536− "spacing" | "gap" => {
2537− if let Some(v) = val {
2538− push_css(&mut css, "gap", &css_px(v));
2539− }
2540− }
2541− "padding" => {
2542− if let Some(v) = val {
2543− push_css(&mut css, "padding", &css_px_multi(v));
2544− }
2545− }
2546− "padding-x" => {
2547− if let Some(v) = val {
2548− push_css(&mut css, "padding-left", &css_px(v));
2549− push_css(&mut css, "padding-right", &css_px(v));
2550− }
2551− }
2552− "padding-y" => {
2553− if let Some(v) = val {
2554− push_css(&mut css, "padding-top", &css_px(v));
2555− push_css(&mut css, "padding-bottom", &css_px(v));
2556− }
2557− }
2558−
2559− // Sizing
2560− "width" => {
2561− if let Some(v) = val {
2562− match v {
2563− "fill" => match parent_kind {
2564− Some(ElementKind::Row) => {
2565− push_css(&mut css, "flex", "1");
2566− push_css(&mut css, "min-width", "0");
2567− }
2568− _ => push_css(&mut css, "width", "100%"),
2569− },
2570− "shrink" => push_css(&mut css, "flex-shrink", "0"),
2571− _ => push_css(&mut css, "width", &css_px(v)),
2572− }
2573− }
2574− }
2575− "height" => {
2576− if let Some(v) = val {
2577− match v {
2578− "fill" => match parent_kind {
2579− Some(ElementKind::Column) => {
2580− push_css(&mut css, "flex", "1");
2581− push_css(&mut css, "min-height", "0");
2582− }
2583− _ => push_css(&mut css, "height", "100%"),
2584− },
2585− "shrink" => push_css(&mut css, "flex-shrink", "0"),
2586− _ => push_css(&mut css, "height", &css_px(v)),
2587− }
2588− }
2589− }
2590− "min-width" => {
2591− if let Some(v) = val {
2592− push_css(&mut css, "min-width", &css_px(v));
2593− }
2594− }
2595− "max-width" => {
2596− if let Some(v) = val {
2597− push_css(&mut css, "max-width", &css_px(v));
2598− }
2599− }
2600− "min-height" => {
2601− if let Some(v) = val {
2602− push_css(&mut css, "min-height", &css_px(v));
2603− }
2604− }
2605− "max-height" => {
2606− if let Some(v) = val {
2607− push_css(&mut css, "max-height", &css_px(v));
2608− }
2609− }
2610−
2611− // Alignment
2612− "center-x" => match parent_kind {
2613− Some(ElementKind::Column) | Some(ElementKind::El) => {
2614− push_css(&mut css, "align-self", "center");
2615− }
2616− _ => {
2617− push_css(&mut css, "margin-left", "auto");
2618− push_css(&mut css, "margin-right", "auto");
2619− }
2620− },
2621− "center-y" => match parent_kind {
2622− Some(ElementKind::Row) => push_css(&mut css, "align-self", "center"),
2623− _ => {
2624− push_css(&mut css, "margin-top", "auto");
2625− push_css(&mut css, "margin-bottom", "auto");
2626− }
2627− },
2628− "align-left" => match parent_kind {
2629− Some(ElementKind::Column) | Some(ElementKind::El) => {
2630− push_css(&mut css, "align-self", "flex-start");
2631− }
2632− _ => push_css(&mut css, "margin-right", "auto"),
2633− },
2634− "align-right" => match parent_kind {
2635− Some(ElementKind::Column) | Some(ElementKind::El) => {
2636− push_css(&mut css, "align-self", "flex-end");
2637− }
2638− _ => push_css(&mut css, "margin-left", "auto"),
2639− },
2640− "align-top" => match parent_kind {
2641− Some(ElementKind::Row) => push_css(&mut css, "align-self", "flex-start"),
2642− _ => push_css(&mut css, "margin-bottom", "auto"),
2643− },
2644− "align-bottom" => match parent_kind {
2645− Some(ElementKind::Row) => push_css(&mut css, "align-self", "flex-end"),
2646− _ => push_css(&mut css, "margin-top", "auto"),
2647− },
2648−
2649− // Style
2650− "background" => {
2651− if let Some(v) = val {
2652− push_css(&mut css, "background", v);
2653− }
2654− }
2655− "color" => {
2656− if let Some(v) = val {
2657− push_css(&mut css, "color", v);
2658− }
2659− }
2660− "border" => {
2661− if let Some(v) = val {
2662− let parts: Vec<&str> = v.splitn(2, ' ').collect();
2663− if parts.len() == 2 {
2664− push_css(
2665− &mut css,
2666− "border",
2667− &format!("{} solid {}", css_px(parts[0]), parts[1]),
2668− );
2669− } else {
2670− push_css(
2671− &mut css,
2672− "border",
2673− &format!("{} solid currentColor", css_px(parts[0])),
2674− );
2675− }
2676− }
2677− }
2678− "border-top" | "border-bottom" | "border-left" | "border-right" => {
2679− if let Some(v) = val {
2680− let parts: Vec<&str> = v.splitn(2, ' ').collect();
2681− if parts.len() == 2 {
2682− push_css(
2683− &mut css,
2684− effective_key,
2685− &format!("{} solid {}", css_px(parts[0]), parts[1]),
2686− );
2687− } else {
2688− push_css(
2689− &mut css,
2690− effective_key,
2691− &format!("{} solid currentColor", css_px(parts[0])),
2692− );
2693− }
2694− }
2695− }
2696− "rounded" => {
2697− if let Some(v) = val {
2698− push_css(&mut css, "border-radius", &css_px(v));
2699− }
2700− }
2701− "bold" => push_css(&mut css, "font-weight", "bold"),
2702− "italic" => push_css(&mut css, "font-style", "italic"),
2703− "underline" => push_css(&mut css, "text-decoration", "underline"),
2704− "size" => {
2705− if let Some(v) = val {
2706− push_css(&mut css, "font-size", &css_px(v));
2707− }
2708− }
2709− "font" => {
2710− if let Some(v) = val {
2711− push_css(&mut css, "font-family", v);
2712− }
2713− }
2714− "transition" => {
2715− if let Some(v) = val {
2716− push_css(&mut css, "transition", v);
2717− }
2718− }
2719− "cursor" => {
2720− if let Some(v) = val {
2721− push_css(&mut css, "cursor", v);
2722− }
2723− }
2724− "opacity" => {
2725− if let Some(v) = val {
2726− push_css(&mut css, "opacity", v);
2727− }
2728− }
2729−
2730− // Typography
2731− "text-align" => {
2732− if let Some(v) = val {
2733− push_css(&mut css, "text-align", v);
2734− }
2735− }
2736− "line-height" => {
2737− if let Some(v) = val {
2738− push_css(&mut css, "line-height", &css_line_height(v));
2739− }
2740− }
2741− "letter-spacing" => {
2742− if let Some(v) = val {
2743− push_css(&mut css, "letter-spacing", &css_px(v));
2744− }
2745− }
2746− "text-transform" => {
2747− if let Some(v) = val {
2748− push_css(&mut css, "text-transform", v);
2749− }
2750− }
2751− "white-space" => {
2752− if let Some(v) = val {
2753− push_css(&mut css, "white-space", v);
2754− }
2755− }
2756−
2757− // Overflow & positioning
2758− "overflow" => {
2759− if let Some(v) = val {
2760− push_css(&mut css, "overflow", v);
2761− }
2762− }
2763− "position" => {
2764− if let Some(v) = val {
2765− push_css(&mut css, "position", v);
2766− }
2767− }
2768− "top" => {
2769− if let Some(v) = val {
2770− push_css(&mut css, "top", &css_px(v));
2771− }
2772− }
2773− "right" => {
2774− if let Some(v) = val {
2775− push_css(&mut css, "right", &css_px(v));
2776− }
2777− }
2778− "bottom" => {
2779− if let Some(v) = val {
2780− push_css(&mut css, "bottom", &css_px(v));
2781− }
2782− }
2783− "left" => {
2784− if let Some(v) = val {
2785− push_css(&mut css, "left", &css_px(v));
2786− }
2787− }
2788− "z-index" => {
2789− if let Some(v) = val {
2790− push_css(&mut css, "z-index", v);
2791− }
2792− }
2793−
2794− // Display & visibility
2795− "display" => {
2796− if let Some(v) = val {
2797− push_css(&mut css, "display", v);
2798− }
2799− }
2800− "visibility" => {
2801− if let Some(v) = val {
2802− push_css(&mut css, "visibility", v);
2803− }
2804− }
2805− "hidden" => push_css(&mut css, "display", "none"),
2806−
2807− // Transform & filters
2808− "transform" => {
2809− if let Some(v) = val {
2810− push_css(&mut css, "transform", v);
2811− }
2812− }
2813− "backdrop-filter" => {
2814− if let Some(v) = val {
2815− push_css(&mut css, "backdrop-filter", v);
2816− }
2817− }
2818−
2819− // Effects
2820− "shadow" => {
2821− if let Some(v) = val {
2822− push_css(&mut css, "box-shadow", v);
2823− }
2824− }
2825−
2826− // Flow
2827− "wrap" => push_css(&mut css, "flex-wrap", "wrap"),
2828− "gap-x" => {
2829− if let Some(v) = val {
2830− push_css(&mut css, "column-gap", &css_px(v));
2831− }
2832− }
2833− "gap-y" => {
2834− if let Some(v) = val {
2835− push_css(&mut css, "row-gap", &css_px(v));
2836− }
2837− }
2838−
2839− // Grid
2840− "grid" => {
2841− push_css(&mut css, "display", "grid");
2842− }
2843− "grid-cols" => {
2844− if let Some(v) = val {
2845− if let Ok(n) = v.parse::<u32>() {
2846− push_css(
2847− &mut css,
2848− "grid-template-columns",
2849− &format!("repeat({},1fr)", n),
2850− );
2851− } else {
2852− push_css(&mut css, "grid-template-columns", v);
2853− }
2854− }
2855− }
2856− "grid-rows" => {
2857− if let Some(v) = val {
2858− if let Ok(n) = v.parse::<u32>() {
2859− push_css(
2860− &mut css,
2861− "grid-template-rows",
2862− &format!("repeat({},1fr)", n),
2863− );
2864− } else {
2865− push_css(&mut css, "grid-template-rows", v);
2866− }
2867− }
2868− }
2869− "col-span" => {
2870− if let Some(v) = val {
2871− push_css(&mut css, "grid-column", &format!("span {}", v));
2872− }
2873− }
2874− "row-span" => {
2875− if let Some(v) = val {
2876− push_css(&mut css, "grid-row", &format!("span {}", v));
2877− }
2878− }
2879−
2880− // Animation
2881− "animation" => {
2882− if let Some(v) = val {
2883− push_css(&mut css, "animation", v);
2884− }
2885− }
2886−
2887− // Aspect ratio
2888− "aspect-ratio" => {
2889− if let Some(v) = val {
2890− push_css(&mut css, "aspect-ratio", v);
2891− }
2892− }
2893−
2894− // CSS containment for rendering performance
2895− "contain" => {
2896− if let Some(v) = val {
2897− push_css(&mut css, "contain", v);
2898− } else {
2899− push_css(&mut css, "contain", "layout style paint");
2900− }
2901− }
2902− "content-visibility" => {
2903− if let Some(v) = val {
2904− push_css(&mut css, "content-visibility", v);
2905− } else {
2906− push_css(&mut css, "content-visibility", "auto");
2907− }
2908− }
2909−
2910− // Outline (like border but doesn't affect layout)
2911− "outline" => {
2912− if let Some(v) = val {
2913− let parts: Vec<&str> = v.splitn(2, ' ').collect();
2914− if parts.len() == 2 {
2915− push_css(
2916− &mut css,
2917− "outline",
2918− &format!("{} solid {}", css_px(parts[0]), parts[1]),
2919− );
2920− } else {
2921− push_css(
2922− &mut css,
2923− "outline",
2924− &format!("{} solid currentColor", css_px(parts[0])),
2925− );
2926− }
2927− }
2928− }
2929−
2930− // Logical properties (i18n-aware)
2931− "padding-inline" => {
2932− if let Some(v) = val {
2933− push_css(&mut css, "padding-inline", &css_px_multi(v));
2934− }
2935− }
2936− "padding-block" => {
2937− if let Some(v) = val {
2938− push_css(&mut css, "padding-block", &css_px_multi(v));
2939− }
2940− }
2941− "margin-inline" => {
2942− if let Some(v) = val {
2943− push_css(&mut css, "margin-inline", &css_px_multi(v));
2944− }
2945− }
2946− "margin-block" => {
2947− if let Some(v) = val {
2948− push_css(&mut css, "margin-block", &css_px_multi(v));
2949− }
2950− }
2951−
2952− // Logical property start/end variants
2953− "padding-inline-start"
2954− | "padding-inline-end"
2955− | "padding-block-start"
2956− | "padding-block-end"
2957− | "margin-inline-start"
2958− | "margin-inline-end"
2959− | "margin-block-start"
2960− | "margin-block-end" => {
2961− if let Some(v) = val {
2962− push_css(&mut css, effective_key, &css_px(v));
2963− }
2964− }
2965−
2966− // Logical inset
2967− "inset-inline" | "inset-block" => {
2968− if let Some(v) = val {
2969− push_css(&mut css, effective_key, &css_px_multi(v));
2970− }
2971− }
2972− "inset-inline-start" | "inset-inline-end" | "inset-block-start" | "inset-block-end" => {
2973− if let Some(v) = val {
2974− push_css(&mut css, effective_key, &css_px(v));
2975− }
2976− }
2977−
2978− // Logical border
2979− "border-inline"
2980− | "border-block"
2981− | "border-inline-start"
2982− | "border-inline-end"
2983− | "border-block-start"
2984− | "border-block-end" => {
2985− if let Some(v) = val {
2986− push_css(&mut css, effective_key, v);
2987− }
2988− }
2989−
2990− // Logical border-radius
2991− "border-start-start-radius"
2992− | "border-start-end-radius"
2993− | "border-end-start-radius"
2994− | "border-end-end-radius" => {
2995− if let Some(v) = val {
2996− push_css(&mut css, effective_key, &css_px(v));
2997− }
2998− }
2999−
3000− // Logical scroll margins & padding
3001− "scroll-margin-inline"
3002− | "scroll-margin-block"
3003− | "scroll-padding-inline"
3004− | "scroll-padding-block" => {
3005− if let Some(v) = val {
3006− push_css(&mut css, effective_key, &css_px_multi(v));
3007− }
3008− }
3009−
3010− // Logical sizing
3011− "inline-size" | "block-size" | "min-inline-size" | "max-inline-size"
3012− | "min-block-size" | "max-block-size" => {
3013− if let Some(v) = val {
3014− push_css(&mut css, effective_key, &css_px(v));
3015− }
3016− }
3017−
3018− // Scroll snap
3019− "scroll-snap-type" => {
3020− if let Some(v) = val {
3021− push_css(&mut css, "scroll-snap-type", v);
3022− }
3023− }
3024− "scroll-snap-align" => {
3025− if let Some(v) = val {
3026− push_css(&mut css, "scroll-snap-align", v);
3027− }
3028− }
3029−
3030− // Margin
3031− "margin" => {
3032− if let Some(v) = val {
3033− push_css(&mut css, "margin", &css_px_multi(v));
3034− }
3035− }
3036− "margin-x" => {
3037− if let Some(v) = val {
3038− push_css(&mut css, "margin-left", &css_px(v));
3039− push_css(&mut css, "margin-right", &css_px(v));
3040− }
3041− }
3042− "margin-y" => {
3043− if let Some(v) = val {
3044− push_css(&mut css, "margin-top", &css_px(v));
3045− push_css(&mut css, "margin-bottom", &css_px(v));
3046− }
3047− }
3048−
3049− // Filter
3050− "filter" => {
3051− if let Some(v) = val {
3052− push_css(&mut css, "filter", v);
3053− }
3054− }
3055−
3056− // Object fit/position (for images)
3057− "object-fit" => {
3058− if let Some(v) = val {
3059− push_css(&mut css, "object-fit", v);
3060− }
3061− }
3062− "object-position" => {
3063− if let Some(v) = val {
3064− push_css(&mut css, "object-position", v);
3065− }
3066− }
3067−
3068− // Text shadow
3069− "text-shadow" => {
3070− if let Some(v) = val {
3071− push_css(&mut css, "text-shadow", v);
3072− }
3073− }
3074−
3075− // Text overflow
3076− "text-overflow" => {
3077− if let Some(v) = val {
3078− push_css(&mut css, "text-overflow", v);
3079− }
3080− }
3081−
3082− // Interaction
3083− "pointer-events" => {
3084− if let Some(v) = val {
3085− push_css(&mut css, "pointer-events", v);
3086− }
3087− }
3088− "user-select" => {
3089− if let Some(v) = val {
3090− push_css(&mut css, "user-select", v);
3091− }
3092− }
3093−
3094− // Flexbox/grid alignment
3095− "justify-content" => {
3096− if let Some(v) = val {
3097− push_css(&mut css, "justify-content", v);
3098− }
3099− }
3100− "align-items" => {
3101− if let Some(v) = val {
3102− push_css(&mut css, "align-items", v);
3103− }
3104− }
3105−
3106− // Flex item order
3107− "order" => {
3108− if let Some(v) = val {
3109− push_css(&mut css, "order", v);
3110− }
3111− }
3112−
3113− // Background extras
3114− "background-size" => {
3115− if let Some(v) = val {
3116− push_css(&mut css, "background-size", v);
3117− }
3118− }
3119− "background-position" => {
3120− if let Some(v) = val {
3121− push_css(&mut css, "background-position", v);
3122− }
3123− }
3124− "background-repeat" => {
3125− if let Some(v) = val {
3126− push_css(&mut css, "background-repeat", v);
3127− }
3128− }
3129−
3130− // Text wrapping
3131− "word-break" => {
3132− if let Some(v) = val {
3133− push_css(&mut css, "word-break", v);
3134− }
3135− }
3136− "overflow-wrap" => {
3137− if let Some(v) = val {
3138− push_css(&mut css, "overflow-wrap", v);
3139− }
3140− }
3141−
3142− // Container queries
3143− "container" => {
3144− push_css(&mut css, "container-type", "inline-size");
3145− }
3146− "container-name" => {
3147− if let Some(v) = val {
3148− push_css(&mut css, "container-name", v);
3149− }
3150− }
3151− "container-type" => {
3152− if let Some(v) = val {
3153− push_css(&mut css, "container-type", v);
3154− }
3155− }
3156−
3157− // Overflow axis
3158− "overflow-x" => {
3159− if let Some(v) = val {
3160− push_css(&mut css, "overflow-x", v);
3161− }
3162− }
3163− "overflow-y" => {
3164− if let Some(v) = val {
3165− push_css(&mut css, "overflow-y", v);
3166− }
3167− }
3168−
3169− // Inset (shorthand for top/right/bottom/left)
3170− "inset" => {
3171− if let Some(v) = val {
3172− push_css(&mut css, "inset", &css_px(v));
3173− }
3174− }
3175−
3176− // Accent & caret colors
3177− "accent-color" => {
3178− if let Some(v) = val {
3179− push_css(&mut css, "accent-color", v);
3180− }
3181− }
3182− "caret-color" => {
3183− if let Some(v) = val {
3184− push_css(&mut css, "caret-color", v);
3185− }
3186− }
3187−
3188− // Color scheme & appearance
3189− "color-scheme" => {
3190− if let Some(v) = val {
3191− push_css(&mut css, "color-scheme", v);
3192− }
3193− }
3194− "appearance" => {
3195− if let Some(v) = val {
3196− push_css(&mut css, "appearance", v);
3197− }
3198− }
3199−
3200− // List style
3201− "list-style" => {
3202− if let Some(v) = val {
3203− push_css(&mut css, "list-style", v);
3204− }
3205− }
3206−
3207− // Table
3208− "border-collapse" => {
3209− if let Some(v) = val {
3210− push_css(&mut css, "border-collapse", v);
3211− }
3212− }
3213− "border-spacing" => {
3214− if let Some(v) = val {
3215− push_css(&mut css, "border-spacing", &css_px(v));
3216− }
3217− }
3218−
3219− // Text decoration
3220− "text-decoration" => {
3221− if let Some(v) = val {
3222− push_css(&mut css, "text-decoration", v);
3223− }
3224− }
3225− "text-decoration-color" => {
3226− if let Some(v) = val {
3227− push_css(&mut css, "text-decoration-color", v);
3228− }
3229− }
3230− "text-decoration-thickness" => {
3231− if let Some(v) = val {
3232− push_css(&mut css, "text-decoration-thickness", &css_px(v));
3233− }
3234− }
3235− "text-decoration-style" => {
3236− if let Some(v) = val {
3237− push_css(&mut css, "text-decoration-style", v);
3238− }
3239− }
3240− "text-underline-offset" => {
3241− if let Some(v) = val {
3242− push_css(&mut css, "text-underline-offset", &css_px(v));
3243− }
3244− }
3245−
3246− // Multi-column
3247− "column-width" => {
3248− if let Some(v) = val {
3249− push_css(&mut css, "column-width", &css_px(v));
3250− }
3251− }
3252− "column-rule" => {
3253− if let Some(v) = val {
3254− push_css(&mut css, "column-rule", v);
3255− }
3256− }
3257−
3258− // Place items/self
3259− "place-items" => {
3260− if let Some(v) = val {
3261− push_css(&mut css, "place-items", v);
3262− }
3263− }
3264− "place-self" => {
3265− if let Some(v) = val {
3266− push_css(&mut css, "place-self", v);
3267− }
3268− }
3269−
3270− // Scroll behavior
3271− "scroll-behavior" => {
3272− if let Some(v) = val {
3273− push_css(&mut css, "scroll-behavior", v);
3274− }
3275− }
3276−
3277− // Resize
3278− "resize" => {
3279− if let Some(v) = val {
3280− push_css(&mut css, "resize", v);
3281− }
3282− }
3283−
3284− // New CSS properties
3285− "clip-path" => {
3286− if let Some(v) = val {
3287− push_css(&mut css, "clip-path", v);
3288− }
3289− }
3290− "mix-blend-mode" => {
3291− if let Some(v) = val {
3292− push_css(&mut css, "mix-blend-mode", v);
3293− }
3294− }
3295− "background-blend-mode" => {
3296− if let Some(v) = val {
3297− push_css(&mut css, "background-blend-mode", v);
3298− }
3299− }
3300− "writing-mode" => {
3301− if let Some(v) = val {
3302− push_css(&mut css, "writing-mode", v);
3303− }
3304− }
3305− "column-count" => {
3306− if let Some(v) = val {
3307− push_css(&mut css, "column-count", v);
3308− }
3309− }
3310− "column-gap" => {
3311− if let Some(v) = val {
3312− push_css(&mut css, "column-gap", &css_px(v));
3313− }
3314− }
3315− "text-indent" => {
3316− if let Some(v) = val {
3317− push_css(&mut css, "text-indent", &css_px(v));
3318− }
3319− }
3320− "hyphens" => {
3321− if let Some(v) = val {
3322− push_css(&mut css, "hyphens", v);
3323− }
3324− }
3325− "flex-grow" => {
3326− if let Some(v) = val {
3327− push_css(&mut css, "flex-grow", v);
3328− }
3329− }
3330− "flex-shrink" => {
3331− if let Some(v) = val {
3332− push_css(&mut css, "flex-shrink", v);
3333− }
3334− }
3335− "flex-basis" => {
3336− if let Some(v) = val {
3337− push_css(&mut css, "flex-basis", &css_px(v));
3338− }
3339− }
3340− "isolation" => {
3341− if let Some(v) = val {
3342− push_css(&mut css, "isolation", v);
3343− }
3344− }
3345− "place-content" => {
3346− if let Some(v) = val {
3347− push_css(&mut css, "place-content", v);
3348− }
3349− }
3350− "background-image" => {
3351− if let Some(v) = val {
3352− push_css(&mut css, "background-image", v);
3353− }
3354− }
3355− "font-weight" => {
3356− if let Some(v) = val {
3357− push_css(&mut css, "font-weight", v);
3358− }
3359− }
3360− "font-style" => {
3361− if let Some(v) = val {
3362− push_css(&mut css, "font-style", v);
3363− }
3364− }
3365− "text-wrap" => {
3366− if let Some(v) = val {
3367− push_css(&mut css, "text-wrap", v);
3368− }
3369− }
3370− "will-change" => {
3371− if let Some(v) = val {
3372− push_css(&mut css, "will-change", v);
3373− }
3374− }
3375− "touch-action" => {
3376− if let Some(v) = val {
3377− push_css(&mut css, "touch-action", v);
3378− }
3379− }
3380− "vertical-align" => {
3381− if let Some(v) = val {
3382− push_css(&mut css, "vertical-align", v);
3383− }
3384− }
3385− "scroll-margin" => {
3386− if let Some(v) = val {
3387− push_css(&mut css, "scroll-margin", &css_px(v));
3388− }
3389− }
3390− "scroll-margin-top"
3391− | "scroll-margin-bottom"
3392− | "scroll-margin-left"
3393− | "scroll-margin-right" => {
3394− if let Some(v) = val {
3395− push_css(&mut css, effective_key, &css_px(v));
3396− }
3397− }
3398− "scroll-padding" => {
3399− if let Some(v) = val {
3400− push_css(&mut css, "scroll-padding", &css_px(v));
3401− }
3402− }
3403− "scroll-padding-top"
3404− | "scroll-padding-bottom"
3405− | "scroll-padding-left"
3406− | "scroll-padding-right" => {
3407− if let Some(v) = val {
3408− push_css(&mut css, effective_key, &css_px(v));
3409− }
3410− }
3411− "direction" => {
3412− if let Some(v) = val {
3413− push_css(&mut css, "direction", v);
3414− }
3415− }
3416−
3417− "content" => {
3418− if let Some(v) = val {
3419− // Wrap in quotes if not already quoted and not a CSS keyword
3420− if v.starts_with('"')
3421− || v.starts_with('\'')
3422− || v == "none"
3423− || v == "normal"
3424− || v.starts_with("attr(")
3425− || v.starts_with("counter(")
3426− {
3427− push_css(&mut css, "content", v);
3428− } else {
3429− push_css(&mut css, "content", &format!("\"{}\"", v));
3430− }
3431− }
3432− }
3433−
3434− // --- CSS Shorthands ---
3435− "truncate" => {
3436− push_css(&mut css, "overflow", "hidden");
3437− push_css(&mut css, "text-overflow", "ellipsis");
3438− push_css(&mut css, "white-space", "nowrap");
3439− }
3440− "line-clamp" => {
3441− if let Some(v) = val {
3442− push_css(&mut css, "display", "-webkit-box");
3443− push_css(&mut css, "-webkit-line-clamp", v);
3444− push_css(&mut css, "-webkit-box-orient", "vertical");
3445− push_css(&mut css, "overflow", "hidden");
3446− }
3447− }
3448− "blur" => {
3449− if let Some(v) = val {
3450− push_css(&mut css, "filter", &format!("blur({})", css_px(v)));
3451− }
3452− }
3453− "backdrop-blur" => {
3454− if let Some(v) = val {
3455− push_css(&mut css, "backdrop-filter", &format!("blur({})", css_px(v)));
3456− }
3457− }
3458− "no-scrollbar" => {
3459− push_css(&mut css, "scrollbar-width", "none");
3460− push_css(&mut css, "-ms-overflow-style", "none");
3461− }
3462− "skeleton" => {
3463− push_css(
3464− &mut css,
3465− "background",
3466− "linear-gradient(90deg,#e5e7eb 25%,#f3f4f6 50%,#e5e7eb 75%)",
3467− );
3468− push_css(&mut css, "background-size", "200% 100%");
3469− push_css(
3470− &mut css,
3471− "animation",
3472− "hl-skeleton 1.5s ease-in-out infinite",
3473− );
3474− }
3475− "gradient" => {
3476− if let Some(v) = val {
3477− // Parse: "from to [angle]" or "color1 color2 [angle]"
3478− let parts: Vec<&str> = v.split_whitespace().collect();
3479− let bg = if parts.len() >= 3
3480− && (parts[2].ends_with("deg")
3481− || parts[2].ends_with("turn")
3482− || parts[2].ends_with("rad"))
3483− {
3484− format!("linear-gradient({},{},{})", parts[2], parts[0], parts[1])
3485− } else if parts.len() >= 2 {
3486− format!("linear-gradient({},{})", parts[0], parts[1])
3487− } else {
3488− format!("linear-gradient({},transparent)", parts[0])
3489− };
3490− push_css(&mut css, "background", &bg);
3491− }
3492− }
3493−
3494− // Grid areas
3495− "grid-template-areas" => {
3496− if let Some(v) = val {
3497− push_css(&mut css, "grid-template-areas", v);
3498− }
3499− }
3500− "grid-area" => {
3501− if let Some(v) = val {
3502− push_css(&mut css, "grid-area", v);
3503− }
3504− }
3505−
3506− // View transitions
3507− "view-transition-name" => {
3508− if let Some(v) = val {
3509− push_css(&mut css, "view-transition-name", v);
3510− }
3511− }
3512−
3513− // Animate shorthand (alias for animation)
3514− "animate" => {
3515− if let Some(v) = val {
3516− push_css(&mut css, "animation", v);
3517− }
3518− }
3519−
3520− // CSS subgrid
3521− "grid-template-columns" => {
3522− if let Some(v) = val {
3523− push_css(&mut css, "grid-template-columns", v);
3524− }
3525− }
3526− "grid-template-rows" => {
3527− if let Some(v) = val {
3528− push_css(&mut css, "grid-template-rows", v);
3529− }
3530− }
3531−
3532− // Scroll-driven animations
3533− "animation-timeline" => {
3534− if let Some(v) = val {
3535− push_css(&mut css, "animation-timeline", v);
3536− }
3537− }
3538− "animation-range" => {
3539− if let Some(v) = val {
3540− push_css(&mut css, "animation-range", v);
3541− }
3542− }
3543− "view-timeline-name" => {
3544− if let Some(v) = val {
3545− push_css(&mut css, "view-timeline-name", v);
3546− }
3547− }
3548− "view-timeline-axis" => {
3549− if let Some(v) = val {
3550− push_css(&mut css, "view-timeline-axis", v);
3551− }
3552− }
3553− "scroll-timeline-name" => {
3554− if let Some(v) = val {
3555− push_css(&mut css, "scroll-timeline-name", v);
3556− }
3557− }
3558− "scroll-timeline-axis" => {
3559− if let Some(v) = val {
3560− push_css(&mut css, "scroll-timeline-axis", v);
3561− }
3562− }
3563−
3564− // Anchor positioning
3565− "anchor-name" => {
3566− if let Some(v) = val {
3567− push_css(&mut css, "anchor-name", v);
3568− }
3569− }
3570− "position-anchor" => {
3571− if let Some(v) = val {
3572− push_css(&mut css, "position-anchor", v);
3573− }
3574− }
3575− "position-area" => {
3576− if let Some(v) = val {
3577− push_css(&mut css, "position-area", v);
3578− }
3579− }
3580− "inset-area" => {
3581− // Legacy alias for position-area
3582− if let Some(v) = val {
3583− push_css(&mut css, "position-area", v);
3584− }
3585− }
3586−
3587− // initial-letter (drop caps)
3588− "initial-letter" => {
3589− if let Some(v) = val {
3590− push_css(&mut css, "initial-letter", v);
3591− }
1658+ } else if ch == '"' || ch == '\'' {
1659+ quote = Some(ch);
1660+ current.push(ch);
1661+ } else if ch == '(' {
1662+ depth += 1;
1663+ current.push(ch);
1664+ } else if ch == ')' {
1665+ depth -= 1;
1666+ current.push(ch);
1667+ } else if ch == ';' && depth == 0 {
1668+ current.push(';');
1669+ let trimmed = current.trim();
1670+ if !trimmed.is_empty() && trimmed != ";" {
1671+ let prop = trimmed
1672+ .trim_end_matches(';')
1673+ .split_once(':')
1674+ .map(|(p, _)| p.trim().to_ascii_lowercase());
1675+ decls.push((prop, std::mem::take(&mut current)));
1676+ } else {
1677+ current.clear();
35921678 }
1679+ } else {
1680+ current.push(ch);
1681+ }
1682+ }
1683+ if !current.trim().is_empty() {
1684+ let prop = current
1685+ .split_once(':')
1686+ .map(|(p, _)| p.trim().to_ascii_lowercase());
1687+ decls.push((prop, std::mem::take(&mut current)));
1688+ }
35931689
3594− // Critical CSS hint — not CSS, handled elsewhere
3595− "critical" => {}
3596−
3597− // Identity and HTML passthrough — not CSS
3598− "id" | "class" => {}
3599− "type" | "placeholder" | "name" | "value" | "disabled" | "required" | "checked"
3600− | "for" | "action" | "method" | "autocomplete" | "min" | "max" | "step" | "pattern"
3601− | "maxlength" | "rows" | "cols" | "multiple" | "alt" | "role" | "tabindex"
3602− | "title" | "controls" | "autoplay" | "loop" | "muted" | "poster" | "preload"
3603− | "loading" | "decoding" | "ordered" | "src" | "open" | "novalidate" | "low"
3604− | "high" | "optimum" | "colspan" | "rowspan" | "scope" | "inline" | "responsive"
3605− | "datetime" | "media" | "sizes" | "srcset" | "cite" | "list" | "sandbox" | "allow"
3606− | "allowfullscreen" | "referrerpolicy" | "formaction" | "formmethod" | "formtarget"
3607− | "target" | "autofocus" => {}
1690+ if decls.len() < 2 {
1691+ return css.to_string();
1692+ }
36081693
3609− _ => {}
1694+ // Find index of last occurrence of each property.
1695+ use std::collections::HashMap;
1696+ let mut last: HashMap<String, usize> = HashMap::new();
1697+ for (i, (prop, _)) in decls.iter().enumerate() {
1698+ if let Some(p) = prop {
1699+ last.insert(p.clone(), i);
36101700 }
36111701 }
36121702
3613− css
1703+ let mut out = String::with_capacity(css.len());
1704+ for (i, (prop, raw)) in decls.iter().enumerate() {
1705+ let keep = match prop {
1706+ Some(p) => last.get(p) == Some(&i),
1707+ None => true,
1708+ };
1709+ if keep {
1710+ out.push_str(raw);
1711+ }
1712+ }
1713+ out
36141714}
36151715
3616−fn push_css(css: &mut String, prop: &str, value: &str) {
3617− css.push_str(prop);
3618− css.push(':');
3619− css.push_str(value);
3620− css.push(';');
1716+fn emit_class_attr(out: &mut String, gen_class: Option<&str>, user_class: Option<&str>) {
1717+ match (gen_class, user_class) {
1718+ (Some(g), Some(u)) => {
1719+ out.push_str(" class=\"");
1720+ out.push_str(g);
1721+ out.push(' ');
1722+ out.push_str(&html_escape(u));
1723+ out.push('"');
1724+ }
1725+ (Some(g), None) => {
1726+ out.push_str(" class=\"");
1727+ out.push_str(g);
1728+ out.push('"');
1729+ }
1730+ (None, Some(u)) => {
1731+ out.push_str(" class=\"");
1732+ out.push_str(&html_escape(u));
1733+ out.push('"');
1734+ }
1735+ (None, None) => {}
1736+ }
36211737}
36221738
3623−/// Known CSS units — if a value ends with one, skip appending `px`.
3624−const CSS_UNITS: &[&str] = &[
3625− "%", "rem", "em", "vh", "vw", "vmin", "vmax", "dvh", "svh", "lvh", "ch", "ex", "cm", "mm",
3626− "in", "pt", "pc", "fr",
3627−];
1739+// ---------------------------------------------------------------------------
1740+// Attribute → CSS mapping
1741+// ---------------------------------------------------------------------------
36281742
3629−/// Format a numeric value: if it already has a CSS unit, pass through as-is;
3630−/// otherwise append `px`.
3631−fn css_px(value: &str) -> String {
3632− let v = value.trim();
3633− if v == "0" {
3634− return "0".to_string();
3635− }
3636− if CSS_UNITS.iter().any(|u| v.ends_with(u)) {
3637− return v.to_string();
3638− }
3639− if v.starts_with("var(")
3640− || v.starts_with("calc(")
3641− || v.starts_with("clamp(")
3642− || v.starts_with("min(")
3643− || v.starts_with("max(")
3644− {
3645− return v.to_string();
3646− }
3647− format!("{}px", v)
1743+/// Where an element is written, which its CSS depends on.
1744+struct Site<'a> {
1745+ kind: &'a ElementKind,
1746+ /// How its parent lays out its children: its `width fill`, `height
1747+ /// fill` and `shrink` compile against it.
1748+ parent: &'a Flow,
1749+ /// It has `@in-front` / `@behind` children.
1750+ has_overlay_children: bool,
1751+ /// A row, column or grid inside text, laid out inline.
1752+ inline: bool,
1753+ /// The page's `<body>`, which the reset already makes a column.
1754+ root: bool,
36481755}
36491756
3650−/// Rewrite literal values that match a declared CSS custom property (from
3651−/// `@theme` or `@let --name value`) to `var(--name)` references. Matches are
3652−/// anchored to CSS value boundaries so e.g. `#3b82f6` inside a longer hex or
3653−/// inside an identifier is not replaced. The `:root` block is emitted before
3654−/// this call runs, so its declarations are not affected.
3655−fn substitute_css_vars(css: &str, vars: &[(String, String)]) -> String {
3656− if css.is_empty() || vars.is_empty() {
3657− return css.to_string();
1757+impl Site<'_> {
1758+ /// Where an element in a parent with the layout `layout` and the flow
1759+ /// `parent` is.
1760+ fn new<'a>(elem: &'a Element, layout: Option<Layout>, parent: &'a Flow) -> Site<'a> {
1761+ Site {
1762+ kind: &elem.kind,
1763+ parent,
1764+ has_overlay_children: has_overlay_children(elem),
1765+ inline: layout == Some(Layout::Text) && elem.kind.layout().is_container(),
1766+ root: false,
1767+ }
36581768 }
3659− // Prefer longer values first so that if two vars share a prefix, the
3660− // longer (more specific) match wins.
3661− let mut pairs: Vec<(&str, String)> = vars
3662− .iter()
3663− .filter(|(name, value)| name.starts_with("--") && !value.is_empty())
3664− .map(|(name, value)| (value.as_str(), format!("var({})", name)))
3665− .collect();
3666− pairs.sort_by_key(|(v, _)| std::cmp::Reverse(v.len()));
3667− if pairs.is_empty() {
3668− return css.to_string();
1769+}
1770+
1771+// ---------------------------------------------------------------------------
1772+// Direction: what a child's `fill` and `shrink` compile against
1773+// ---------------------------------------------------------------------------
1774+
1775+/// The way a flex row or column lays out its children.
1776+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
1777+enum Axis {
1778+ Row,
1779+ Column,
1780+}
1781+
1782+impl Axis {
1783+ /// The direction a `flex-direction` or `flex-flow` value sets, if it
1784+ /// names one (not `var(--dir)`, which only the browser knows).
1785+ fn of_value(value: &str) -> Option<Axis> {
1786+ value.split_whitespace().find_map(|word| match word {
1787+ "row" | "row-reverse" => Some(Axis::Row),
1788+ "column" | "column-reverse" => Some(Axis::Column),
1789+ _ => None,
1790+ })
36691791 }
1792+}
36701793
3671− let is_boundary_before = |b: Option<u8>| match b {
3672− None => true,
3673− Some(c) => matches!(
3674− c,
3675− b':' | b' ' | b',' | b'(' | b';' | b'{' | b'\n' | b'\t'
3676− ),
3677− };
3678− let is_boundary_after = |b: Option<u8>| match b {
3679− None => true,
3680− Some(c) => matches!(
3681− c,
3682− b';' | b'}' | b',' | b' ' | b')' | b'\n' | b'\t'
3683− ),
3684− };
1794+/// How an element lays out its children, as its CSS sets it: the
1795+/// direction its children's `width`/`height` `fill` and `shrink` compile
1796+/// against. That is the direction of `@row` or of a column, or the one its
1797+/// own `flex-direction` (or `flex-flow`) sets, with or without media or
1798+/// container prefixes. Like elm-ui's `.r > .wf`, the rules for a direction
1799+/// set under a prefix are keyed on the element's class: `@media (...) {
1800+/// :where(.a)>.b {...} }`.
1801+#[derive(Clone, Default)]
1802+struct Flow {
1803+ /// Without a prefix; `None` when the element isn't a flex row or column
1804+ /// (a grid, text, HTML's own layout, the top of the page)
1805+ base: Option<Axis>,
1806+ /// The direction under each chain of at-rule prefixes that sets one, in
1807+ /// the order their blocks are written
1808+ changes: Vec<(Vec<usize>, Axis)>,
1809+ /// The element's generated class, which the rules for the changes are
1810+ /// keyed on
1811+ class: Option<String>,
1812+}
36851813
3686− let bytes = css.as_bytes();
3687− let mut out = String::with_capacity(css.len());
3688− let mut i = 0;
3689− let mut prev: Option<u8> = None;
3690− while i < bytes.len() {
3691− if is_boundary_before(prev) {
3692− let mut matched = false;
3693− for (val, repl) in &pairs {
3694− let vb = val.as_bytes();
3695− if i + vb.len() <= bytes.len() && &bytes[i..i + vb.len()] == vb {
3696− let next = bytes.get(i + vb.len()).copied();
3697− if is_boundary_after(next) {
3698− out.push_str(repl);
3699− prev = repl.as_bytes().last().copied();
3700− i += vb.len();
3701− matched = true;
3702− break;
3703− }
3704− }
1814+impl Flow {
1815+ fn of(elem: &Element) -> Flow {
1816+ let mut base = match elem.kind.layout() {
1817+ Layout::Row => Axis::Row,
1818+ Layout::Column => Axis::Column,
1819+ _ => return Flow::default(),
1820+ };
1821+ let mut changes: Vec<(Vec<usize>, Axis)> = Vec::new();
1822+ for attr in elem.attrs.iter().filter(|a| !a.html) {
1823+ let (condition, name) = Condition::of(&attr.key);
1824+ if !matches!(name, "flex-direction" | "flex-flow") || !condition.selector.is_empty() {
1825+ continue;
37051826 }
3706− if matched {
1827+ let Some(axis) = attr.value.as_deref().and_then(Axis::of_value) else {
37071828 continue;
1829+ };
1830+ if condition.at.is_empty() {
1831+ base = axis;
1832+ } else {
1833+ // The later one wins, as in the CSS
1834+ changes.retain(|(at, _)| *at != condition.at);
1835+ changes.push((condition.at, axis));
37081836 }
37091837 }
3710− // Advance by one UTF-8 code point.
3711− let start = i;
3712− i += 1;
3713− while i < bytes.len() && (bytes[i] & 0xC0) == 0x80 {
3714− i += 1;
1838+ changes.sort_by_key(|(at, _)| at_order(at));
1839+ Flow {
1840+ base: Some(base),
1841+ changes,
1842+ class: None,
37151843 }
3716− out.push_str(&css[start..i]);
3717− prev = bytes.get(i - 1).copied();
37181844 }
3719− out
3720−}
37211845
3722−/// Format a `line-height` value. CSS accepts either a unitless multiplier
3723−/// (e.g. `1.5`) or a length (e.g. `24px`). Plain integers in htmlang source
3724−/// are ambiguous: `[line-height 24]` was historically emitted as `24` (which
3725−/// CSS interprets as 24× font-size — almost never what anyone wants). Treat
3726−/// integers ≥ 2 as pixel lengths; anything with a decimal, an existing unit,
3727−/// or the value `0`/`1` passes through unchanged.
3728−fn css_line_height(value: &str) -> String {
3729− let v = value.trim();
3730− if v == "0" || v == "1" {
3731− return v.to_string();
3732− }
3733− if v.contains('.') {
3734− return v.to_string();
3735− }
3736− if CSS_UNITS.iter().any(|u| v.ends_with(u)) || v.ends_with("px") {
3737− return v.to_string();
3738− }
3739− if v.starts_with("var(")
3740− || v.starts_with("calc(")
3741− || v.starts_with("clamp(")
3742− || v.starts_with("min(")
3743− || v.starts_with("max(")
3744− {
3745− return v.to_string();
1846+ /// The direction under the at-rules `at`: the latest one set among
1847+ /// the conditions that hold there (`md:` holds at `lg:`), else the one
1848+ /// without a prefix.
1849+ fn at(&self, at: &[usize]) -> Option<Axis> {
1850+ let base = self.base?;
1851+ let here = Condition::at_only(at);
1852+ let changed = self
1853+ .changes
1854+ .iter()
1855+ .rev()
1856+ .find(|(chain, _)| Condition::at_only(chain).holds_at(&here))
1857+ .map(|&(_, axis)| axis);
1858+ Some(changed.unwrap_or(base))
37461859 }
3747− // Plain integer — treat as pixel length.
3748− if v.chars().all(|c| c.is_ascii_digit()) {
3749− return format!("{}px", v);
3750− }
3751− v.to_string()
37521860}
37531861
3754−/// Format multiple space-separated values, each getting px if needed.
3755−fn css_px_multi(value: &str) -> String {
3756− value
3757− .split_whitespace()
3758− .map(css_px)
3759− .collect::<Vec<_>>()
3760− .join(" ")
1862+/// `width` or `height`.
1863+#[derive(Clone, Copy, PartialEq, Eq)]
1864+enum Dim {
1865+ Width,
1866+ Height,
37611867}
37621868
3763−fn extract_id_class(attrs: &[Attribute]) -> (Option<String>, Option<String>) {
3764− let mut id = None;
3765− let mut class = None;
3766− for attr in attrs {
3767− match attr.key.as_str() {
3768− "id" => id = attr.value.clone(),
3769− "class" => class = attr.value.clone(),
3770− _ => {}
3771− }
3772− }
3773− (id, class)
1869+/// What a `width` or `height` says.
1870+#[derive(Clone, Copy, PartialEq, Eq)]
1871+enum Size {
1872+ Fill,
1873+ Shrink,
1874+ /// A size of its own (`width 300`)
1875+ Set,
37741876}
37751877
3776−/// Read image dimensions from a local file by parsing the header bytes.
3777−/// Supports PNG, JPEG, GIF, WebP, AVIF, and SVG.
3778−fn read_image_dimensions(path: &str) -> Option<(u32, u32)> {
3779− // SVG: parse as text for viewBox/width/height attributes
3780− if path.ends_with(".svg") || path.ends_with(".SVG") {
3781− let text = std::fs::read_to_string(path).ok()?;
3782− return read_svg_dimensions(&text);
1878+impl Size {
1879+ fn of(value: &str) -> Size {
1880+ match value.trim() {
1881+ "fill" => Size::Fill,
1882+ "shrink" => Size::Shrink,
1883+ _ => Size::Set,
1884+ }
37831885 }
1886+}
37841887
3785− let data = std::fs::read(path).ok()?;
3786− if data.len() < 12 {
3787− return None;
1888+/// The declarations `fill` and `shrink` make in a parent laid out along
1889+/// `axis` (`None`: not a flex row or column). Along the parent's direction,
1890+/// `fill` takes the remaining space and `shrink` keeps the content's size;
1891+/// across it (or outside flex), `fill` is the full size and `shrink` fits
1892+/// the content.
1893+fn sizing(dim: Dim, size: Size, axis: Option<Axis>) -> &'static [(&'static str, &'static str)] {
1894+ match (dim, size, axis) {
1895+ (_, Size::Set, _) => &[],
1896+ (Dim::Width, Size::Fill, Some(Axis::Row)) => &[("flex", "1"), ("min-width", "0")],
1897+ (Dim::Width, Size::Fill, _) => &[("width", "100%")],
1898+ (Dim::Width, Size::Shrink, Some(Axis::Row)) => &[("flex-shrink", "0")],
1899+ (Dim::Width, Size::Shrink, _) => &[("width", "fit-content")],
1900+ (Dim::Height, Size::Fill, Some(Axis::Column)) => &[("flex", "1"), ("min-height", "0")],
1901+ (Dim::Height, Size::Fill, _) => &[("height", "100%")],
1902+ (Dim::Height, Size::Shrink, Some(Axis::Column)) => &[("flex-shrink", "0")],
1903+ (Dim::Height, Size::Shrink, _) => &[("height", "fit-content")],
37881904 }
1905+}
37891906
3790− // PNG: 8-byte signature, then IHDR chunk with width/height at bytes 16-23
3791− if data.len() >= 24 && data.starts_with(b"\x89PNG\r\n\x1a\n") {
3792− let w = u32::from_be_bytes([data[16], data[17], data[18], data[19]]);
3793− let h = u32::from_be_bytes([data[20], data[21], data[22], data[23]]);
3794− return Some((w, h));
1907+/// Every property `fill` and `shrink` of `dim` can set, with its initial
1908+/// value (`flex` covers `flex-shrink`).
1909+fn sizing_properties(dim: Dim) -> [(&'static str, &'static str); 3] {
1910+ match dim {
1911+ Dim::Width => [
1912+ ("flex", "0 1 auto"),
1913+ ("min-width", "auto"),
1914+ ("width", "auto"),
1915+ ],
1916+ Dim::Height => [
1917+ ("flex", "0 1 auto"),
1918+ ("min-height", "auto"),
1919+ ("height", "auto"),
1920+ ],
37951921 }
1922+}
37961923
3797− // GIF: "GIF87a" or "GIF89a", width/height at bytes 6-9 (little-endian)
3798− if data.starts_with(b"GIF87a") || data.starts_with(b"GIF89a") {
3799− let w = u16::from_le_bytes([data[6], data[7]]) as u32;
3800− let h = u16::from_le_bytes([data[8], data[9]]) as u32;
3801− return Some((w, h));
3802− }
1924+/// What an element's attributes under some prefixes say about its size.
1925+#[derive(Default)]
1926+struct Sizes {
1927+ /// The last `width` and `height`
1928+ width: Option<Size>,
1929+ height: Option<Size>,
1930+ /// A `fill` or `shrink` for the width / height is among them (a later
1931+ /// size may replace it)
1932+ width_word: bool,
1933+ height_word: bool,
1934+ /// It writes `flex`, one of its longhands (`flex-grow`, `flex-shrink`,
1935+ /// `flex-basis`), `min-width` or `min-height` itself
1936+ flex: bool,
1937+ flex_grow: bool,
1938+ flex_shrink: bool,
1939+ flex_basis: bool,
1940+ min_width: bool,
1941+ min_height: bool,
1942+}
38031943
3804− // JPEG: scan for SOF0/SOF2 marker (0xFF 0xC0 or 0xFF 0xC2)
3805− if data.starts_with(b"\xff\xd8") {
3806− let mut i = 2;
3807− while i + 9 < data.len() {
3808− if data[i] != 0xFF {
3809− i += 1;
1944+impl Sizes {
1945+ /// Read the attributes under the conditions that hold wherever `at`
1946+ /// does, a later condition over an earlier one.
1947+ fn of(attrs: &[Attribute], at: &Condition) -> Sizes {
1948+ let mut sizes = Sizes::default();
1949+ let mut read: Vec<(Condition, &str, &str)> = Vec::new();
1950+ for attr in attrs.iter().filter(|a| !a.html) {
1951+ let (condition, name) = Condition::of(&attr.key);
1952+ let Some(value) = attr.value.as_deref().filter(|v| !v.trim().is_empty()) else {
38101953 continue;
1954+ };
1955+ if condition.holds_at(at) {
1956+ read.push((condition, name, value));
1957+ }
1958+ }
1959+ read.sort_by_cached_key(|(condition, _, _)| condition.order());
1960+ for (_, name, value) in read {
1961+ match name {
1962+ "width" => {
1963+ let size = Size::of(value);
1964+ sizes.width = Some(size);
1965+ sizes.width_word |= size != Size::Set;
1966+ }
1967+ "height" => {
1968+ let size = Size::of(value);
1969+ sizes.height = Some(size);
1970+ sizes.height_word |= size != Size::Set;
1971+ }
1972+ "flex" => sizes.flex = true,
1973+ "flex-grow" => sizes.flex_grow = true,
1974+ "flex-shrink" => sizes.flex_shrink = true,
1975+ "flex-basis" => sizes.flex_basis = true,
1976+ "min-width" => sizes.min_width = true,
1977+ "min-height" => sizes.min_height = true,
1978+ _ => {}
38111979 }
3812− let marker = data[i + 1];
3813− if marker == 0xC0 || marker == 0xC2 {
3814− let h = u16::from_be_bytes([data[i + 5], data[i + 6]]) as u32;
3815− let w = u16::from_be_bytes([data[i + 7], data[i + 8]]) as u32;
3816− return Some((w, h));
3817− }
3818− if i + 3 < data.len() {
3819− let len = u16::from_be_bytes([data[i + 2], data[i + 3]]) as usize;
3820− i += 2 + len;
3821− } else {
3822− break;
1980+ }
1981+ sizes
1982+ }
1983+
1984+ /// The element writes `property` itself: a layout word leaves it alone.
1985+ fn writes(&self, property: &str) -> bool {
1986+ match property {
1987+ "flex" => self.flex,
1988+ "flex-grow" => self.flex || self.flex_grow,
1989+ "flex-shrink" => self.flex || self.flex_shrink,
1990+ "flex-basis" => self.flex || self.flex_basis,
1991+ "min-width" => self.min_width,
1992+ "min-height" => self.min_height,
1993+ "width" => self.width == Some(Size::Set),
1994+ "height" => self.height == Some(Size::Set),
1995+ _ => false,
1996+ }
1997+ }
1998+
1999+ /// Write a layout word's `property: value`, unless the element writes
2000+ /// the property itself. When it writes some of `flex`'s longhands, a
2001+ /// `flex` is written as the others (`flex-shrink 0, width fill` still
2002+ /// grows).
2003+ fn push(&self, css: &mut String, property: &str, value: &str) {
2004+ if property == "flex" && !self.flex {
2005+ let longhands = match value {
2006+ "1" => [
2007+ ("flex-grow", "1"),
2008+ ("flex-shrink", "1"),
2009+ ("flex-basis", "0%"),
2010+ ],
2011+ // The reset, `0 1 auto`
2012+ _ => [
2013+ ("flex-grow", "0"),
2014+ ("flex-shrink", "1"),
2015+ ("flex-basis", "auto"),
2016+ ],
2017+ };
2018+ if longhands.iter().any(|&(p, _)| self.writes(p)) {
2019+ for (longhand, value) in longhands {
2020+ if !self.writes(longhand) {
2021+ push_css(css, longhand, value);
2022+ }
2023+ }
2024+ return;
38232025 }
38242026 }
2027+ if !self.writes(property) {
2028+ push_css(css, property, value);
2029+ }
38252030 }
2031+}
38262032
3827− // WebP: "RIFF" ... "WEBP", VP8 header at byte 20
3828− if data.len() >= 30 && &data[..4] == b"RIFF" && &data[8..12] == b"WEBP" {
3829− if &data[12..16] == b"VP8 " && data.len() >= 30 {
3830− let w = u16::from_le_bytes([data[26], data[27]]) as u32 & 0x3FFF;
3831− let h = u16::from_le_bytes([data[28], data[29]]) as u32 & 0x3FFF;
3832− return Some((w, h));
2033+/// The rule that gives an element's `fill` and `shrink`, as its attributes
2034+/// under the at-rules `at` set them, their meaning in a parent laid out
2035+/// along `axis`. Every other property a layout word could have set is put
2036+/// back to its initial value, so the rule is right whichever earlier rule
2037+/// it overrides. Properties the element writes itself are left alone.
2038+fn sizing_rule(attrs: &[Attribute], at: &[usize], axis: Axis) -> String {
2039+ let sizes = Sizes::of(attrs, &Condition::at_only(at));
2040+ let mut sets: Vec<(&str, &str)> = Vec::new();
2041+ let mut resets: Vec<(&str, &str)> = Vec::new();
2042+ for (dim, size, word) in [
2043+ (Dim::Width, sizes.width, sizes.width_word),
2044+ (Dim::Height, sizes.height, sizes.height_word),
2045+ ] {
2046+ if !word {
2047+ continue;
38332048 }
3834− if &data[12..16] == b"VP8L" && data.len() >= 25 && data[21] == 0x2F {
3835− let bits = u32::from_le_bytes([data[22], data[23], data[24], data[25]]);
3836− let w = (bits & 0x3FFF) + 1;
3837− let h = ((bits >> 14) & 0x3FFF) + 1;
3838− return Some((w, h));
2049+ if let Some(size) = size {
2050+ sets.extend_from_slice(sizing(dim, size, Some(axis)));
38392051 }
2052+ resets.extend_from_slice(&sizing_properties(dim));
38402053 }
3841−
3842− // AVIF: ISOBMFF container with "ftyp" box containing "avif"/"avis" brand,
3843− // then "ispe" box with width/height
3844− if data.len() >= 12 && &data[4..8] == b"ftyp" {
3845− let brand = &data[8..12];
3846− if brand == b"avif" || brand == b"avis" || brand == b"mif1" {
3847− return read_avif_dimensions(&data);
2054+ let mut css = String::new();
2055+ let mut written: Vec<&str> = Vec::new();
2056+ for &(property, value) in &resets {
2057+ if sets.iter().any(|&(p, _)| p == property) || written.contains(&property) {
2058+ continue;
38482059 }
2060+ written.push(property);
2061+ sizes.push(&mut css, property, value);
38492062 }
2063+ for &(property, value) in &sets {
2064+ sizes.push(&mut css, property, value);
2065+ }
2066+ css
2067+}
38502068
3851− None
2069+/// The rules an element's `fill` and `shrink` need under each chain of
2070+/// at-rules where the direction of `flow` (its parent's) changes: `(at,
2071+/// body)`.
2072+fn sizing_changes(attrs: &[Attribute], flow: &Flow) -> Vec<(Vec<usize>, String)> {
2073+ flow.changes
2074+ .iter()
2075+ .map(|(at, axis)| (at.clone(), sizing_rule(attrs, at, *axis)))
2076+ .filter(|(_, body)| !body.is_empty())
2077+ .collect()
38522078}
38532079
3854−/// Parse SVG viewBox or width/height attributes to get dimensions.
3855−fn read_svg_dimensions(text: &str) -> Option<(u32, u32)> {
3856− // Try viewBox first: viewBox="minX minY width height"
3857− if let Some(vb_start) = text.find("viewBox=\"") {
3858− let rest = &text[vb_start + 9..];
3859− if let Some(end) = rest.find('"') {
3860− let parts: Vec<&str> = rest[..end].split_whitespace().collect();
3861− if parts.len() == 4
3862− && let (Ok(w), Ok(h)) = (parts[2].parse::<f64>(), parts[3].parse::<f64>())
3863− && w > 0.0
3864− && h > 0.0
3865− {
3866− return Some((w.round() as u32, h.round() as u32));
3867− }
2080+/// An element's generated class, with the rules keyed on its parent's
2081+/// class that its `fill` and `shrink` need where the parent's direction
2082+/// changes under a prefix (see [`Flow`]): `:where(.a)>.b`, one class of
2083+/// specificity like any class rule.
2084+fn element_class(elem: &Element, site: &Site, styles: &mut StyleCollector) -> Option<String> {
2085+ let as_child = match site.parent.class {
2086+ Some(_) => sizing_changes(&elem.attrs, site.parent),
2087+ None => Vec::new(),
2088+ };
2089+ // Two elements with the same CSS but different rules keyed on them
2090+ // need two classes
2091+ let mut distinct = String::new();
2092+ for (at, body) in &as_child {
2093+ distinct.push_str(&format!("<{:?}{}", at, body));
2094+ }
2095+ let class = compute_class(&elem.attrs, site, styles, distinct)?;
2096+ if let Some(parent) = &site.parent.class {
2097+ for (at, body) in as_child {
2098+ styles.add_keyed(at, format!(":where(.{})>.{}", parent, class), body);
38682099 }
38692100 }
3870− // Fall back to width/height attributes on <svg>
3871− let svg_tag = text.find("<svg")?;
3872− let tag_end = text[svg_tag..].find('>')? + svg_tag;
3873− let tag = &text[svg_tag..tag_end];
3874− let w = extract_svg_attr(tag, "width")?;
3875− let h = extract_svg_attr(tag, "height")?;
3876− Some((w, h))
2101+ Some(class)
38772102}
38782103
3879−fn extract_svg_attr(tag: &str, attr: &str) -> Option<u32> {
3880− let needle = format!("{}=\"", attr);
3881− let start = tag.find(&needle)? + needle.len();
3882− let rest = &tag[start..];
3883− let end = rest.find('"')?;
3884− let val = rest[..end].trim_end_matches("px");
3885− val.parse::<f64>().ok().map(|v| v.round() as u32)
2104+/// The `display` of a layout (nothing for text, native and void elements,
2105+/// which keep HTML's own).
2106+fn layout_css(layout: Layout, inline: bool) -> &'static str {
2107+ match (layout, inline) {
2108+ (Layout::Column, false) => "display:flex;flex-direction:column;",
2109+ (Layout::Column, true) => "display:inline-flex;flex-direction:column;",
2110+ (Layout::Row, false) => "display:flex;flex-direction:row;",
2111+ (Layout::Row, true) => "display:inline-flex;flex-direction:row;",
2112+ (Layout::Grid, false) => "display:grid;",
2113+ (Layout::Grid, true) => "display:inline-grid;",
2114+ _ => "",
2115+ }
38862116}
38872117
3888−/// Parse AVIF (ISOBMFF) container to find ispe box with image dimensions.
3889−fn read_avif_dimensions(data: &[u8]) -> Option<(u32, u32)> {
3890− // Walk ISOBMFF boxes looking for "ispe" (image spatial extents)
3891− let mut i = 0;
3892− while i + 8 <= data.len() {
3893− let box_size =
3894− u32::from_be_bytes([data[i], data[i + 1], data[i + 2], data[i + 3]]) as usize;
3895− let box_type = &data[i + 4..i + 8];
3896− if box_size < 8 {
3897− break;
2118+/// The declarations of the attributes under `condition` (the defaults of
2119+/// the element's kind are [`default_css`]'s).
2120+fn attrs_to_css(attrs: &[Attribute], condition: &Condition, site: &Site) -> String {
2121+ let mut css = String::new();
2122+ // The auto margins of `center-x`, `align-left`, ..., written at the end
2123+ let mut aligned = String::new();
2124+ let kind = site.kind;
2125+ // Under `children:` the styles go on the children, whose parent is this
2126+ // element: htmlang's words that place an element in its parent are an
2127+ // error there (the parser reports them), and left out
2128+ let on_children = condition.on_children();
2129+ let inside = condition.inside().is_some();
2130+ // The direction `fill` and `shrink` compile against
2131+ let axis = site.parent.at(&condition.at);
2132+
2133+ // htmlang's words for laying out children (`spacing`, `wrap`,
2134+ // `grid-cols`) mean nothing on an element that doesn't lay out its
2135+ // children, which the parser reports; they are left out. Under
2136+ // `children:` they go on the children, whose layout isn't known here.
2137+ let lays_out_children = kind.layout().is_container() || on_children;
2138+ fn under<'k>(key: &'k str, condition: &Condition) -> Option<&'k str> {
2139+ let (c, name) = Condition::of(key);
2140+ (c == *condition).then_some(name)
2141+ }
2142+
2143+ for (index, attr) in attrs.iter().enumerate() {
2144+ if attr.html {
2145+ continue;
2146+ }
2147+ let Some(effective_key) = under(&attr.key, condition) else {
2148+ continue;
2149+ };
2150+ if on_children && crate::vocab::places_in_parent(effective_key, attr.value.as_deref()) {
2151+ continue;
38982152 }
3899− let box_end = (i + box_size).min(data.len());
3900− // ispe box: 4 bytes version/flags + 4 bytes width + 4 bytes height
3901− if box_type == b"ispe" && box_end >= i + 20 {
3902− let w = u32::from_be_bytes([data[i + 12], data[i + 13], data[i + 14], data[i + 15]]);
3903− let h = u32::from_be_bytes([data[i + 16], data[i + 17], data[i + 18], data[i + 19]]);
3904− return Some((w, h));
3905− }
3906− // Recurse into container boxes (meta, iprp, ipco)
3907− if matches!(
3908− box_type,
3909− b"meta" | b"iprp" | b"ipco" | b"moov" | b"trak" | b"mdia"
3910− ) {
3911− let header_size = if box_type == b"meta" { 12 } else { 8 };
3912− if i + header_size < box_end
3913− && let Some(dims) = read_avif_dimensions(&data[i + header_size..box_end])
2153+ // Under an element prefix (`@td:`) the styles go on elements whose
2154+ // layout and parent aren't known here: htmlang's own words are an
2155+ // error there (the parser reports them), and left out
2156+ if inside && crate::vocab::is_htmlang_word(effective_key, attr.value.as_deref()) {
2157+ continue;
2158+ }
2159+
2160+ let val = attr.value.as_deref();
2161+ // A style whose value came out empty (a field a record doesn't
2162+ // have, `${if()}` without its other branch) is left out
2163+ if val.is_some_and(|v| v.trim().is_empty()) {
2164+ continue;
2165+ }
2166+
2167+ match effective_key {
2168+ // htmlang's own words: they lay out children or place the
2169+ // element in its parent, and mean more than one CSS property
2170+ "spacing" if !lays_out_children => {}
2171+ "spacing" => {
2172+ if let Some(v) = val {
2173+ push_css(&mut css, "gap", &with_px("gap", v));
2174+ }
2175+ }
2176+
2177+ // Sizing: `fill` and `shrink` compile against the parent's
2178+ // direction. Only the last `width` (`height`) counts, as for
2179+ // any style written twice.
2180+ "width" | "height" if val.is_some_and(|v| Size::of(v) != Size::Set) => {
2181+ let later = attrs[index + 1..].iter().any(|a| {
2182+ !a.html
2183+ && under(&a.key, condition) == Some(effective_key)
2184+ && a.value.as_deref().is_some_and(|v| !v.trim().is_empty())
2185+ });
2186+ if later {
2187+ continue;
2188+ }
2189+ let dim = if effective_key == "width" {
2190+ Dim::Width
2191+ } else {
2192+ Dim::Height
2193+ };
2194+ let size = Size::of(val.unwrap_or_default());
2195+ // What the element writes itself, which a layout word
2196+ // leaves alone
2197+ let sizes = Sizes::of(attrs, condition);
2198+ for &(property, value) in sizing(dim, size, axis) {
2199+ sizes.push(&mut css, property, value);
2200+ }
2201+ }
2202+
2203+ // A size of its own under a prefix, where a `fill` or
2204+ // `shrink` that sets `flex` (along a flex parent's direction)
2205+ // holds too: the word's `flex` and minimum are put back, so the
2206+ // size is the one the element gets (`width fill, lg:width 200`
2207+ // in a row)
2208+ "width" | "height"
2209+ if *condition != Condition::default()
2210+ && attrs.iter().any(|a| {
2211+ let (c, name) = Condition::of(&a.key);
2212+ let along = match site.parent.at(&c.at) {
2213+ Some(Axis::Row) => name == "width",
2214+ Some(Axis::Column) => name == "height",
2215+ None => false,
2216+ };
2217+ !a.html
2218+ && name == effective_key
2219+ && along
2220+ && c != *condition
2221+ && c.holds_at(condition)
2222+ && a.value
2223+ .as_deref()
2224+ .is_some_and(|v| !v.trim().is_empty() && Size::of(v) != Size::Set)
2225+ }) =>
39142226 {
3915− return Some(dims);
2227+ let dim = if effective_key == "width" {
2228+ Dim::Width
2229+ } else {
2230+ Dim::Height
2231+ };
2232+ let sizes = Sizes::of(attrs, condition);
2233+ for (property, value) in sizing_properties(dim) {
2234+ if property != effective_key {
2235+ sizes.push(&mut css, property, value);
2236+ }
2237+ }
2238+ if let Some(v) = val {
2239+ push_css(&mut css, effective_key, &with_px(effective_key, v));
2240+ }
2241+ }
2242+
2243+ // Alignment: auto margins, which work along either direction.
2244+ // They are written last, so a `margin` on the same element
2245+ // keeps its other sides (`center-x, margin 20`)
2246+ "center-x" => {
2247+ push_css(&mut aligned, "margin-left", "auto");
2248+ push_css(&mut aligned, "margin-right", "auto");
2249+ }
2250+ "center-y" => {
2251+ push_css(&mut aligned, "margin-top", "auto");
2252+ push_css(&mut aligned, "margin-bottom", "auto");
2253+ }
2254+ "align-left" => push_css(&mut aligned, "margin-right", "auto"),
2255+ "align-right" => push_css(&mut aligned, "margin-left", "auto"),
2256+ "align-top" => push_css(&mut aligned, "margin-bottom", "auto"),
2257+ "align-bottom" => push_css(&mut aligned, "margin-top", "auto"),
2258+
2259+ "wrap" if lays_out_children => push_css(&mut css, "flex-wrap", "wrap"),
2260+ "wrap" => {}
2261+
2262+ // Grid
2263+ "grid-cols" | "grid-rows" if !lays_out_children => {}
2264+ "grid-cols" | "grid-rows" => {
2265+ if let Some(v) = val {
2266+ let property = if effective_key == "grid-cols" {
2267+ "grid-template-columns"
2268+ } else {
2269+ "grid-template-rows"
2270+ };
2271+ match v.parse::<u32>() {
2272+ Ok(n) => push_css(&mut css, property, &format!("repeat({},1fr)", n)),
2273+ Err(_) => push_css(&mut css, property, &with_px(property, v)),
2274+ }
2275+ }
2276+ }
2277+ "col-span" | "row-span" => {
2278+ if let Some(v) = val {
2279+ let property = if effective_key == "col-span" {
2280+ "grid-column"
2281+ } else {
2282+ "grid-row"
2283+ };
2284+ push_css(&mut css, property, &format!("span {}", v));
2285+ }
2286+ }
2287+
2288+ // CSS's `line-clamp` has no support yet without its
2289+ // `-webkit-` fallback, which needs a box to clamp
2290+ "line-clamp" => {
2291+ if let Some(v) = val {
2292+ push_css(&mut css, "display", "-webkit-box");
2293+ push_css(&mut css, "-webkit-line-clamp", v);
2294+ push_css(&mut css, "-webkit-box-orient", "vertical");
2295+ push_css(&mut css, "overflow", "hidden");
2296+ }
2297+ }
2298+
2299+ // Every other name is a CSS property (standard, custom,
2300+ // vendor-prefixed, or one htmlang doesn't know, which the
2301+ // parser warned about), written under its own name with the
2302+ // value as written, except for `px` after a bare number where
2303+ // the property takes a length
2304+ key if crate::vocab::is_property_name(key) => {
2305+ if let Some(v) = val {
2306+ push_css(&mut css, key, &with_px(key, v));
2307+ }
39162308 }
2309+
2310+ _ => {}
2311+ }
2312+ }
2313+
2314+ css.push_str(&aligned);
2315+ css
2316+}
2317+
2318+fn push_css(css: &mut String, prop: &str, value: &str) {
2319+ css.push_str(prop);
2320+ css.push(':');
2321+ css.push_str(value);
2322+ css.push(';');
2323+}
2324+
2325+fn extract_id_class(attrs: &[Attribute]) -> (Option<String>, Option<String>) {
2326+ let mut id = None;
2327+ let mut class = None;
2328+ for attr in attrs.iter().filter(|a| a.html) {
2329+ match attr.key.as_str() {
2330+ "id" => id = attr.value.clone(),
2331+ "class" => class = attr.value.clone(),
2332+ _ => {}
39172333 }
3918− i = box_end;
39192334 }
3920− None
2335+ (id, class)
39212336}
39222337
39232338fn html_escape(s: &str) -> String {
@@ -3958,10 +2373,24 @@ fn base64_encode(data: &[u8]) -> String {
39582373/// Generate a standard v3 source map with VLQ-encoded mappings.
39592374/// Compatible with browser devtools and source map tooling.
39602375pub fn generate_source_map(doc: &Document, source_file: &str) -> String {
2376+ source_map_for_html(&generate_dev(doc), source_file)
2377+}
2378+
2379+/// Build a source map for dev-mode HTML by reading the `data-hl-line`
2380+/// markers each element carries, so generated line numbers are exact.
2381+pub fn source_map_for_html(html: &str, source_file: &str) -> String {
39612382 let mut mappings: Vec<(usize, usize)> = Vec::new(); // (html_line, hl_line)
3962− collect_source_lines(&doc.nodes, &mut mappings);
3963− mappings.sort_by_key(|m| m.0);
3964− mappings.dedup_by_key(|m| m.0);
2383+ for (idx, line) in html.lines().enumerate() {
2384+ if let Some(pos) = line.find("data-hl-line=\"") {
2385+ let digits: String = line[pos + "data-hl-line=\"".len()..]
2386+ .chars()
2387+ .take_while(|c| c.is_ascii_digit())
2388+ .collect();
2389+ if let Ok(hl_line) = digits.parse::<usize>() {
2390+ mappings.push((idx + 1, hl_line));
2391+ }
2392+ }
2393+ }
39652394
39662395 // Build VLQ-encoded mappings string.
39672396 // Each generated line is separated by ';'. Each segment within a line is
@@ -4021,60 +2450,30 @@ fn vlq_encode(value: i64, out: &mut String) {
40212450 }
40222451}
40232452
4024−fn collect_source_lines(nodes: &[Node], mappings: &mut Vec<(usize, usize)>) {
4025− for node in nodes {
4026− if let Node::Element(elem) = node {
4027− if elem.line_num > 0 {
4028− mappings.push((mappings.len() + 1, elem.line_num));
4029− }
4030− collect_source_lines(&elem.children, mappings);
4031− }
4032− }
4033−}
4034−
4035−/// Check if a specific element kind exists anywhere in the node tree.
4036−fn has_element_kind(nodes: &[Node], target: &ElementKind) -> bool {
4037− for node in nodes {
4038− if let Node::Element(elem) = node {
4039− if elem.kind == *target {
4040− return true;
4041− }
4042− if has_element_kind(&elem.children, target) {
4043− return true;
4044− }
4045− }
4046− }
4047− false
4048−}
4049−
4050−/// Collect unique external domains from generated HTML for DNS prefetch hints.
4051−fn collect_dns_prefetch(html: &str, dev: bool) -> String {
4052− let mut domains = Vec::new();
4053− let mut rest = html;
4054− while let Some(pos) = rest.find("https://") {
4055− let start = pos + 8; // skip "https://"
4056− rest = &rest[start..];
4057− let end = rest
4058− .find(['/', '"', '\'', ' ', '>', ')'])
4059− .unwrap_or(rest.len());
4060− let domain = &rest[..end];
4061− if !domain.is_empty() && domain.contains('.') && !domains.contains(&domain.to_string()) {
4062− domains.push(domain.to_string());
4063− }
4064− }
4065− let mut out = String::new();
4066− for domain in &domains {
4067− if dev {
4068− out.push_str(&format!(
4069− "<link rel=\"dns-prefetch\" href=\"//{}\">\n",
4070− domain
4071− ));
4072− } else {
4073− out.push_str(&format!(
4074− "<link rel=\"dns-prefetch\" href=\"//{}\">",
4075− domain
4076− ));
4077− }
2453+#[cfg(test)]
2454+mod tests {
2455+ use super::*;
2456+
2457+ #[test]
2458+ fn a_name_is_a_stable_hash_of_the_style() {
2459+ // The same in every build and on every platform
2460+ assert_eq!(stable_hash(""), 0xf52a_15e9_a9b5_e89b);
2461+ assert_eq!(hash_digits(35, 3), "z00");
2462+ assert_eq!(hash_digits(u64::MAX, 13), "fsgs46211e5w3");
2463+ }
2464+
2465+ #[test]
2466+ fn a_name_taken_in_the_file_takes_more_digits() {
2467+ // These two styles' hashes end in the same 7 digits
2468+ let mut styles = StyleCollector::new();
2469+ let first = styles.get_class("width:129555px;".into(), Vec::new(), String::new());
2470+ let second = styles.get_class("width:170577px;".into(), Vec::new(), String::new());
2471+ let (first, second) = (first.unwrap(), second.unwrap());
2472+ assert_eq!(first.len(), 3 + CLASS_DIGITS, "{first}");
2473+ assert_eq!(second.len(), 3 + CLASS_DIGITS + 1, "{second}");
2474+ assert!(second.starts_with(&first), "{first} {second}");
2475+ // The same style gets the name it got before
2476+ let again = styles.get_class("width:170577px;".into(), Vec::new(), String::new());
2477+ assert_eq!(again.as_deref(), Some(second.as_str()));
40782478 }
4079− out
40802479}