@@ -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;
@@ -611,709 +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+ }
919+
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);
731927
732− // Skip-to-content link for accessibility (only when @main exists)
733− if has_main {
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− element_css.push_str(&styles.to_css_formatted(dev, !has_custom_css));
993+ element_css.push_str(&styles_css);
790994
791− // @keyframes
792− for (name, kf_body) in &doc.keyframes {
995+ // @style blocks (custom CSS)
996+ for block in &doc.custom_css {
793997 if dev {
794− element_css.push_str(&format!("@keyframes {} {{\n{}\n}}\n", name, kf_body));
998+ element_css.push_str(block);
999+ element_css.push('\n');
7951000 } else {
796− element_css.push_str(&format!("@keyframes {}{{{}}}", name, kf_body));
1001+ element_css.push_str(&compact_css(block));
7971002 }
7981003 }
7991004
800− // Auto-inject skeleton keyframe if skeleton attribute is used
801− let skeleton_used = element_css.contains("hl-skeleton");
802− if skeleton_used {
803− if dev {
804− element_css.push_str("@keyframes hl-skeleton {\n 0% { background-position: 200% 0; }\n 100% { background-position: -200% 0; }\n}\n");
805− } else {
806− element_css.push_str("@keyframes hl-skeleton{0%{background-position:200% 0}100%{background-position:-200% 0}}");
807− }
808− }
809−
810− // Also inject carousel webkit scrollbar hiding
811− let carousel_used = element_css.contains("scroll-snap-type:x mandatory");
812− if carousel_used && !element_css.contains("::-webkit-scrollbar") {
813− // The carousel class already has scrollbar-width:none, but webkit needs pseudo-element
814− // We add a global rule for carousel-style elements
815− }
816−
817− // @style blocks (custom CSS)
818− for block in &doc.custom_css {
819− if dev {
820− element_css.push_str(block);
821− element_css.push('\n');
822− } else {
823− // Minify: collapse whitespace
824− let minified: String = block.lines().map(|l| l.trim()).collect::<Vec<_>>().join("");
825− element_css.push_str(&minified);
826− }
827− }
828−
829− // @scope blocks
830− for block in &doc.scope_blocks {
831− if dev {
832− element_css.push_str(block);
833− element_css.push('\n');
834− } else {
835− let minified: String = block.lines().map(|l| l.trim()).collect::<Vec<_>>().join("");
836− element_css.push_str(&minified);
837− }
838− }
839−
840− // @starting-style blocks
841− if !doc.starting_style_blocks.is_empty() {
842− if dev {
843− element_css.push_str("@starting-style {\n");
844− for block in &doc.starting_style_blocks {
845− element_css.push_str(block);
846− element_css.push('\n');
847− }
848− element_css.push_str("}\n");
849− } else {
850− element_css.push_str("@starting-style{");
851− for block in &doc.starting_style_blocks {
852− let minified: String = block.lines().map(|l| l.trim()).collect::<Vec<_>>().join("");
853− element_css.push_str(&minified);
854− }
855− element_css.push('}');
856− }
857− }
858−
859− // Build meta tags string
860− let meta_html = if doc.meta_tags.is_empty() {
861− String::new()
862− } else {
863− let mut m = String::new();
864− for (name, content) in &doc.meta_tags {
865− if dev {
866− m.push_str(&format!(
867− "<meta name=\"{}\" content=\"{}\">\n",
868− html_escape(name),
869− html_escape(content)
870− ));
871− } else {
872− m.push_str(&format!(
873− "<meta name=\"{}\" content=\"{}\">",
874− html_escape(name),
875− html_escape(content)
876− ));
877− }
878− }
879− m
880− };
881−
882− // Build OG meta tags
883− let og_html = if doc.og_tags.is_empty() {
884− String::new()
885− } else {
886− let mut o = String::new();
887− for (property, content) in &doc.og_tags {
888− if dev {
889− o.push_str(&format!(
890− "<meta property=\"og:{}\" content=\"{}\">\n",
891− html_escape(property),
892− html_escape(content)
893− ));
894− } else {
895− o.push_str(&format!(
896− "<meta property=\"og:{}\" content=\"{}\">",
897− html_escape(property),
898− html_escape(content)
899− ));
900− }
901− }
902− o
903− };
904−
905− // Build head blocks string
906− let head_html = if doc.head_blocks.is_empty() {
907− String::new()
908− } else {
909− let mut h = String::new();
910− for block in &doc.head_blocks {
911− h.push_str(block);
912− if dev {
913− h.push('\n');
914− }
915− }
916− h
917− };
918−
919− let lang_attr = match &doc.lang {
920− Some(lang) => format!(" lang=\"{}\"", html_escape(lang)),
921− None => String::new(),
922− };
923−
924− let favicon_html = match &doc.favicon {
925− Some(path) => {
926− // Try to read and inline the favicon
927− if let Ok(data) = std::fs::read(path) {
928− let mime = if path.ends_with(".ico") {
929− "image/x-icon"
930− } else if path.ends_with(".png") {
931− "image/png"
932− } else if path.ends_with(".svg") {
933− "image/svg+xml"
934− } else {
935− "image/x-icon"
936− };
937− let b64 = base64_encode(&data);
938− if dev {
939− format!(
940− "<link rel=\"icon\" href=\"data:{};base64,{}\">\n",
941− mime, b64
942− )
943− } else {
944− format!("<link rel=\"icon\" href=\"data:{};base64,{}\">", mime, b64)
945− }
946− } else {
947− // Fall back to href
948− if dev {
949− format!("<link rel=\"icon\" href=\"{}\">\n", html_escape(path))
950− } else {
951− format!("<link rel=\"icon\" href=\"{}\">", html_escape(path))
952− }
953− }
954− }
955− None => String::new(),
956− };
957−
958− // Canonical URL
959− let canonical_html = match &doc.canonical {
960− Some(url) => {
961− if dev {
962− format!("<link rel=\"canonical\" href=\"{}\">\n", html_escape(url))
963− } else {
964− format!("<link rel=\"canonical\" href=\"{}\">", html_escape(url))
965− }
966− }
967− None => String::new(),
968− };
1005+ element_css
1006+}
9691007
970− // Base URL
971− let base_html = match &doc.base_url {
972− Some(url) => {
973− if dev {
974− format!("<base href=\"{}\">\n", html_escape(url))
975− } else {
976− format!("<base href=\"{}\">", html_escape(url))
977− }
978− }
979− None => String::new(),
980− };
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+}
9811019
982− // @font-face CSS
983− for (name, url) in &doc.font_faces {
984− let format_hint = if url.ends_with(".woff2") {
985− " format('woff2')"
986− } else if url.ends_with(".woff") {
987− " format('woff')"
988− } else if url.ends_with(".ttf") {
989− " format('truetype')"
990− } else if url.ends_with(".otf") {
991− " format('opentype')"
992− } else {
993− ""
994− };
995− if dev {
996− element_css.insert_str(0, &format!(
997− "@font-face {{\n font-family: '{}';\n src: url('{}'){};\n font-display: swap;\n}}\n",
998− name, url, format_hint
999− ));
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()
10001050 } else {
1001− element_css.insert_str(
1002− 0,
1003− &format!(
1004− "@font-face{{font-family:'{}';src:url('{}'){};font-display:swap}}",
1005− name, url, format_hint
1006− ),
1007− );
1008− }
1009− }
1010−
1011− // JSON-LD blocks
1012− let json_ld_html: String = doc
1013− .json_ld_blocks
1014− .iter()
1015− .map(|block| {
1016− if dev {
1017− format!(
1018− "<script type=\"application/ld+json\">\n{}\n</script>\n",
1019− block
1020− )
1021− } else {
1022− format!("<script type=\"application/ld+json\">{}</script>", block)
1023− }
1024− })
1025− .collect();
1026−
1027− // Manifest link
1028− let manifest_html = if let Some(ref manifest) = doc.manifest {
1029− let mut json = String::from("{");
1030− json.push_str(&format!("\"name\":\"{}\",", manifest.name));
1031− if let Some(ref short) = manifest.short_name {
1032− json.push_str(&format!("\"short_name\":\"{}\",", short));
1033− }
1034− json.push_str(&format!("\"start_url\":\"{}\",", manifest.start_url));
1035− json.push_str(&format!("\"display\":\"{}\"", manifest.display));
1036− if let Some(ref bg) = manifest.background_color {
1037− json.push_str(&format!(",\"background_color\":\"{}\"", bg));
1038− }
1039− if let Some(ref tc) = manifest.theme_color {
1040− json.push_str(&format!(",\"theme_color\":\"{}\"", tc));
1041− }
1042− if let Some(ref desc) = manifest.description {
1043− json.push_str(&format!(",\"description\":\"{}\"", desc));
1044− }
1045− if !manifest.icons.is_empty() {
1046− json.push_str(",\"icons\":[");
1047− for (i, (src, sizes)) in manifest.icons.iter().enumerate() {
1048− if i > 0 {
1049− json.push(',');
1050− }
1051− json.push_str(&format!(
1052− "{{\"src\":\"{}\",\"sizes\":\"{}\",\"type\":\"image/png\"}}",
1053− src, sizes
1054− ));
1055− }
1056− json.push(']');
1057− }
1058− json.push('}');
1059−
1060− // Inline the manifest as a data URI
1061− let encoded = base64_encode(json.as_bytes());
1062− if dev {
1063− format!(
1064− "<link rel=\"manifest\" href=\"data:application/manifest+json;base64,{}\">\n",
1065− encoded
1066− )
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()
10671055 } else {
1068− format!(
1069− "<link rel=\"manifest\" href=\"data:application/manifest+json;base64,{}\">",
1070− encoded
1071− )
1072− }
1056+ "body{margin:0;font-family:system-ui,-apple-system,sans-serif;display:flex;flex-direction:column;min-height:100dvh}".to_string()
1057+ });
10731058 } else {
1074− String::new()
1075− };
1076−
1077− // Preload hints (auto-detect fonts from @font-face)
1078− let mut preload_html = String::new();
1079− for (_, url) in &doc.font_faces {
1080− if dev {
1081− preload_html.push_str(&format!(
1082− "<link rel=\"preload\" href=\"{}\" as=\"font\" type=\"font/woff2\" crossorigin>\n",
1083− url
1084− ));
1085− } else {
1086− preload_html.push_str(&format!(
1087− "<link rel=\"preload\" href=\"{}\" as=\"font\" type=\"font/woff2\" crossorigin>",
1088− url
1089− ));
1090− }
1091− }
1092− // Explicit preload hints from the document
1093− for hint in &doc.preload_hints {
1094− if dev {
1095− preload_html.push_str(&format!(
1096− "<link rel=\"preload\" href=\"{}\" as=\"{}\"{}>\n",
1097− html_escape(&hint.href),
1098− hint.as_type,
1099− if hint.crossorigin { " crossorigin" } else { "" }
1100− ));
1059+ rules.push(if dev {
1060+ format!("{own}, {own}::before, {own}::after {{ box-sizing: border-box; }}")
11011061 } else {
1102− preload_html.push_str(&format!(
1103− "<link rel=\"preload\" href=\"{}\" as=\"{}\"{}>",
1104− html_escape(&hint.href),
1105− hint.as_type,
1106− if hint.crossorigin { " crossorigin" } else { "" }
1107− ));
1108− }
1062+ format!("{own},{own}::before,{own}::after{{box-sizing:border-box}}")
1063+ });
11091064 }
1110−
1111− // Auto theme-color meta from @theme primary token
1112− let theme_color_html = doc
1113− .theme_tokens
1114− .iter()
1115− .find(|(name, _)| name == "primary" || name == "theme-color")
1116− .map(|(_, value)| {
1117− if dev {
1118− format!(
1119− "<meta name=\"theme-color\" content=\"{}\">\n",
1120− html_escape(value)
1121− )
1122− } else {
1123− format!(
1124− "<meta name=\"theme-color\" content=\"{}\">",
1125− html_escape(value)
1126− )
1127− }
1128− })
1129− .unwrap_or_default();
1130−
1131− // Focus-visible CSS for interactive elements (accessibility)
1132− let focus_visible_css = if ctx.has_interactive {
1133− if dev {
1134− "a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 2px solid currentColor; outline-offset: 2px; }\n"
1135− } else {
1136− "a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid currentColor;outline-offset:2px}"
1137− }
1138− } else {
1139− ""
1140− };
1141−
1142− // Skip-to-content CSS (visually hidden but accessible)
1143− let skip_link_css = if has_main {
1144− if dev {
1145− ".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"
1146− } else {
1147− ".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}"
1148− }
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; }}")
11491069 } else {
1150− ""
1151− };
1152−
1153− // Noscript fallback: show deferred content if JS is disabled
1154− let noscript_html = if ctx.has_defer {
1155− if dev {
1156− "<noscript><style>.hl-defer-placeholder { display: none; }</style></noscript>\n"
1157− } else {
1158− "<noscript><style>.hl-defer-placeholder{display:none}</style></noscript>"
1159− }
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+ )
11601083 } else {
1161− ""
1162− };
1163−
1164− match &doc.page_title {
1165− Some(title) => {
1166− if dev {
1167− format!(
1168− "\
1169−<!DOCTYPE html>
1170−<html{lang_attr}>
1171−<head>
1172−<meta charset=\"utf-8\">
1173−<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">
1174−<title>{title}</title>
1175−{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}\
1176−<style>
1177−*, *::before, *::after {{ box-sizing: border-box; }}
1178−body {{ margin: 0; font-family: system-ui, -apple-system, sans-serif; }}
1179−img {{ display: block; }}
1180−{focus_visible_css}{skip_link_css}{element_css}\
1181−</style>
1182−{noscript_html}\
1183−</head>
1184−<body>
1185−{body}\
1186−</body>
1187−</html>
1188−",
1189− title = html_escape(title),
1190− lang_attr = lang_attr,
1191− theme_color_html = theme_color_html,
1192− base_html = base_html,
1193− canonical_html = canonical_html,
1194− manifest_html = manifest_html,
1195− preload_html = preload_html,
1196− dns_prefetch_html = dns_prefetch_html,
1197− meta_html = meta_html,
1198− favicon_html = favicon_html,
1199− json_ld_html = json_ld_html,
1200− head_html = head_html,
1201− og_html = og_html,
1202− focus_visible_css = focus_visible_css,
1203− skip_link_css = skip_link_css,
1204− noscript_html = noscript_html,
1205− element_css = element_css,
1206− body = body,
1207− )
1208− } else {
1209− format!(
1210− "<!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>",
1211− title = html_escape(title),
1212− lang_attr = lang_attr,
1213− theme_color_html = theme_color_html,
1214− base_html = base_html,
1215− canonical_html = canonical_html,
1216− manifest_html = manifest_html,
1217− preload_html = preload_html,
1218− dns_prefetch_html = dns_prefetch_html,
1219− meta_html = meta_html,
1220− og_html = og_html,
1221− favicon_html = favicon_html,
1222− json_ld_html = json_ld_html,
1223− head_html = head_html,
1224− focus_visible_css = focus_visible_css,
1225− skip_link_css = skip_link_css,
1226− noscript_html = noscript_html,
1227− element_css = element_css,
1228− body = body,
1229− )
1230− }
1231− }
1232− None => {
1233− if element_css.is_empty() {
1234− body
1235− } else if dev {
1236− format!("<style>\n{}</style>\n{}", element_css, body)
1237− } else {
1238− format!("<style>{}</style>{}", element_css, body)
1239− }
1240− }
1084+ format!("@layer {};@layer hl-reset{{{}}}", LAYERS.join(","), rules)
12411085 }
12421086}
12431087
12441088/// Generate an HTML fragment: body + optional <style>, no <html>/<head>/<body> wrapper.
1245−fn generate_partial_inner(doc: &Document, dev: bool) -> String {
1089+fn generate_partial_inner(doc: &Document, dev: bool, classes: &mut Vec<Class>) -> String {
12461090 let mut styles = StyleCollector::new();
12471091 let mut ctx = GenContext {
12481092 dev,
12491093 depth: 0,
1250− image_count: 0,
12511094 has_interactive: false,
1252− has_defer: false,
1095+ in_text: false,
1096+ flow: Flow::default(),
1097+ in_picture: false,
12531098 };
12541099 let mut body = String::new();
12551100
1256− for node in &doc.nodes {
1257− generate_node(node, None, &mut body, &mut styles, &mut ctx);
1258− }
1259−
1260− let has_custom_css = !doc.custom_css.is_empty();
1261− let mut element_css = String::new();
1262−
1263− // CSS custom properties
1264− if !doc.css_vars.is_empty() || !doc.theme_tokens.is_empty() {
1265− if dev {
1266− element_css.push_str(":root {\n");
1267− for (name, value) in &doc.css_vars {
1268− element_css.push_str(&format!(" {}: {};\n", name, value));
1269− }
1270− for (name, value) in &doc.theme_tokens {
1271− let css_name = format!("--{}", name);
1272− if !doc.css_vars.iter().any(|(n, _)| *n == css_name) {
1273− element_css.push_str(&format!(" {}: {};\n", css_name, value));
1274− }
1275− }
1276− element_css.push_str("}\n");
1277− } else {
1278− element_css.push_str(":root{");
1279− for (name, value) in &doc.css_vars {
1280− element_css.push_str(name);
1281− element_css.push(':');
1282− element_css.push_str(value);
1283− element_css.push(';');
1284− }
1285− for (name, value) in &doc.theme_tokens {
1286− let css_name = format!("--{}", name);
1287− if !doc.css_vars.iter().any(|(n, _)| *n == css_name) {
1288− element_css.push_str(&css_name);
1289− element_css.push(':');
1290− element_css.push_str(value);
1291− element_css.push(';');
1292− }
1293− }
1294− element_css.push('}');
1295− }
1296− }
1297−
1298− element_css.push_str(&styles.to_css_formatted(dev, !has_custom_css));
1299−
1300− for (name, kf_body) in &doc.keyframes {
1301− if dev {
1302− element_css.push_str(&format!("@keyframes {} {{\n{}\n}}\n", name, kf_body));
1303− } else {
1304− element_css.push_str(&format!("@keyframes {}{{{}}}", name, kf_body));
1305− }
1306− }
1101+ generate_children(&doc.nodes, None, &mut body, &mut styles, &mut ctx);
13071102
1308− for block in &doc.custom_css {
1309− if dev {
1310− element_css.push_str(block);
1311− element_css.push('\n');
1312− } else {
1313− let minified: String = block.lines().map(|l| l.trim()).collect::<Vec<_>>().join("");
1314− element_css.push_str(&minified);
1315− }
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, ""));
13161108 }
1109+ classes.extend(styles.classes());
13171110
13181111 if element_css.is_empty() {
13191112 body
@@ -1328,44 +1121,20 @@ fn generate_partial_inner(doc: &Document, dev: bool) -> String {
13281121// Node generation
13291122// ---------------------------------------------------------------------------
13301123
1124+/// Write `node`, which is inside an element with the layout `parent`
1125+/// (`None` at the top of the page).
13311126fn generate_node(
13321127 node: &Node,
1333− parent_kind: Option<&ElementKind>,
1128+ parent: Option<Layout>,
13341129 out: &mut String,
13351130 styles: &mut StyleCollector,
13361131 ctx: &mut GenContext,
13371132) {
13381133 match node {
1339− Node::Element(elem) => generate_element(elem, parent_kind, out, styles, ctx),
1134+ Node::Element(elem) => generate_element(elem, parent, out, styles, ctx),
13401135 Node::Text(segments) => {
1341− let needs_wrap = matches!(
1342− parent_kind,
1343− Some(ElementKind::Row)
1344− | Some(ElementKind::Column)
1345− | Some(ElementKind::El)
1346− | Some(ElementKind::Nav)
1347− | Some(ElementKind::Header)
1348− | Some(ElementKind::Footer)
1349− | Some(ElementKind::Main)
1350− | Some(ElementKind::Section)
1351− | Some(ElementKind::Article)
1352− | Some(ElementKind::Aside)
1353− | Some(ElementKind::ListItem)
1354− | Some(ElementKind::Form)
1355− | Some(ElementKind::Details)
1356− | Some(ElementKind::Figure)
1357− | Some(ElementKind::Blockquote)
1358− | Some(ElementKind::Dialog)
1359− | Some(ElementKind::DefinitionList)
1360− | Some(ElementKind::DefinitionDescription)
1361− | Some(ElementKind::Fieldset)
1362− | Some(ElementKind::Datalist)
1363− | Some(ElementKind::Grid)
1364− | Some(ElementKind::Stack)
1365− | Some(ElementKind::Noscript)
1366− | Some(ElementKind::Address)
1367− | Some(ElementKind::Search)
1368− );
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);
13691138 if needs_wrap {
13701139 out.push_str(&ctx.indent());
13711140 out.push_str("<span>");
@@ -1384,174 +1153,191 @@ fn generate_node(
13841153 }
13851154}
13861155
1387−/// HTML attributes that are passed through to the HTML tag rather than converted to CSS.
1388−const HTML_PASSTHROUGH_ATTRS: &[&str] = &[
1389− "type",
1390− "placeholder",
1391− "name",
1392− "value",
1393− "disabled",
1394− "required",
1395− "checked",
1396− "for",
1397− "action",
1398− "method",
1399− "autocomplete",
1400− "min",
1401− "max",
1402− "step",
1403− "pattern",
1404− "maxlength",
1405− "rows",
1406− "cols",
1407− "multiple",
1408− "alt",
1409− "role",
1410− "tabindex",
1411− "title",
1412− "autofocus",
1413− // Media
1414− "controls",
1415− "autoplay",
1416− "loop",
1417− "muted",
1418− "poster",
1419− "preload",
1420− // Image optimization
1421− "loading",
1422− "decoding",
1423− // Media src (explicit attribute form)
1424− "src",
1425− // New element attributes
1426− "datetime",
1427− "media",
1428− "sizes",
1429− "srcset",
1430− "list",
1431− // Details
1432− "open",
1433− // Form
1434− "novalidate",
1435− // Progress/Meter
1436− "low",
1437− "high",
1438− "optimum",
1439− // Table
1440− "colspan",
1441− "rowspan",
1442− "scope",
1443− // Popover API
1444− "popover",
1445− "popovertarget",
1446− "popovertargetaction",
1447− // Modern form/input hints
1448− "inputmode",
1449− "enterkeyhint",
1450− // Performance hints
1451− "fetchpriority",
1452− "blocking",
1453− // Global attrs
1454− "translate",
1455− "spellcheck",
1456− // ARIA live regions
1457− "aria-live",
1458− "aria-atomic",
1459− "aria-relevant",
1460−];
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+}
14611170
1462−/// Boolean HTML attributes (rendered without a value, e.g., `<input disabled>`).
1463−const BOOLEAN_HTML_ATTRS: &[&str] = &[
1464− "disabled",
1465− "required",
1466− "checked",
1467− "multiple",
1468− "controls",
1469− "autoplay",
1470− "loop",
1471− "muted",
1472− "open",
1473− "novalidate",
1474− "autofocus",
1475− "defer",
1476− "async",
1477− "nomodule",
1478− // Popover
1479− "popover",
1480−];
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+}
14811183
1482−fn emit_html_passthrough_attrs(out: &mut String, attrs: &[Attribute]) {
1483− for attr in attrs {
1484− let key = attr.key.as_str();
1485− let is_passthrough = HTML_PASSTHROUGH_ATTRS.contains(&key)
1486− || key.starts_with("aria-")
1487− || key.starts_with("data-");
1488− 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);
14891201 continue;
14901202 }
1491− if BOOLEAN_HTML_ATTRS.contains(&key) && attr.value.is_none() {
1492− out.push(' ');
1493− out.push_str(key);
1494− } else if let Some(val) = &attr.value {
1495− out.push(' ');
1496− out.push_str(key);
1497− out.push_str("=\"");
1498− out.push_str(&html_escape(val));
1499− 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;
1216+ }
1217+ *previous = Some(matches!(child, Node::Text(_)));
1218+ }
1219+}
1220+
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);
15001266 }
15011267 }
15021268}
15031269
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+ })
1311+}
1312+
15041313fn generate_element(
15051314 elem: &Element,
1506− parent_kind: Option<&ElementKind>,
1315+ parent: Option<Layout>,
15071316 out: &mut String,
15081317 styles: &mut StyleCollector,
15091318 ctx: &mut GenContext,
15101319) {
15111320 // Self-closing elements
1512− if matches!(
1513− elem.kind,
1514− ElementKind::Image
1515− | ElementKind::Input
1516− | ElementKind::HorizontalRule
1517− | ElementKind::Source
1518− | ElementKind::Spacer
1519− ) {
1520− 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);
15211323 return;
15221324 }
1523− // @script renders as <script> with raw body content (no HTML escaping)
1524− 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);
15251329 out.push_str(&ctx.indent());
1526− out.push_str("<script");
1527− // Pass through src, type, defer, async, etc.
1528− for attr in &elem.attrs {
1529− let key = attr.key.as_str();
1530− if matches!(
1531− key,
1532− "src"
1533− | "type"
1534− | "defer"
1535− | "async"
1536− | "crossorigin"
1537− | "integrity"
1538− | "nomodule"
1539− | "id"
1540− ) {
1541− if let Some(val) = &attr.value {
1542− out.push(' ');
1543− out.push_str(key);
1544− out.push_str("=\"");
1545− out.push_str(&html_escape(val));
1546− out.push('"');
1547− } else {
1548− out.push(' ');
1549− out.push_str(key);
1550− }
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)));
15511337 }
15521338 }
1339+ emit_html_attrs(out, &elem.attrs);
15531340 out.push('>');
1554− // Children are raw JS code, not HTML
15551341 for child in &elem.children {
15561342 match child {
15571343 Node::Text(segments) => {
@@ -1565,46 +1351,10 @@ fn generate_element(
15651351 _ => {}
15661352 }
15671353 }
1568− out.push_str("</script>");
1569− out.push_str(ctx.nl());
1570− return;
1571− }
1572− // @breadcrumb generates semantic <nav aria-label="breadcrumb"><ol>...</ol></nav>
1573− if elem.kind == ElementKind::Breadcrumb {
1574− let gen_class = compute_class(&elem.attrs, &elem.kind, parent_kind, styles);
1575− let (id, user_class) = extract_id_class(&elem.attrs);
1576− out.push_str(&ctx.indent());
1577− out.push_str("<nav aria-label=\"breadcrumb\"");
1578− emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
1579− if let Some(id) = id {
1580− out.push_str(" id=\"");
1581− out.push_str(&html_escape(&id));
1582− out.push('"');
1583− }
1354+ out.push_str("</");
1355+ out.push_str(tag);
15841356 out.push('>');
15851357 out.push_str(ctx.nl());
1586− ctx.depth += 1;
1587− out.push_str(&ctx.indent());
1588− out.push_str("<ol>");
1589− out.push_str(ctx.nl());
1590− ctx.depth += 1;
1591− for child in &elem.children {
1592− out.push_str(&ctx.indent());
1593− out.push_str("<li>");
1594− let mut buf = String::new();
1595− generate_node(child, Some(&elem.kind), &mut buf, styles, ctx);
1596− out.push_str(buf.trim());
1597− out.push_str("</li>");
1598− out.push_str(ctx.nl());
1599− }
1600− ctx.depth -= 1;
1601− out.push_str(&ctx.indent());
1602− out.push_str("</ol>");
1603− out.push_str(ctx.nl());
1604− ctx.depth -= 1;
1605− out.push_str(&ctx.indent());
1606− out.push_str("</nav>");
1607− out.push_str(ctx.nl());
16081358 return;
16091359 }
16101360 if elem.kind == ElementKind::Children {
@@ -1614,185 +1364,38 @@ fn generate_element(
16141364 return;
16151365 }
16161366 if elem.kind == ElementKind::Fragment {
1617− // Render children without a wrapper element
1618− for child in &elem.children {
1619− generate_node(child, parent_kind, out, styles, ctx);
1620− }
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);
16211370 return;
16221371 }
16231372
1373+ let mut own = Flow::of(elem);
16241374 let tag = match &elem.kind {
1625− ElementKind::Row
1626− | ElementKind::Column
1627− | ElementKind::El
1628− | ElementKind::Grid
1629− | ElementKind::Stack => "div",
1375+ ElementKind::Row | ElementKind::El => "div",
16301376 ElementKind::Text => "span",
16311377 ElementKind::Paragraph => "p",
16321378 ElementKind::Link => "a",
1633− ElementKind::Button => "button",
1634− ElementKind::Select => "select",
1635− ElementKind::Textarea => "textarea",
1636− ElementKind::Option => "option",
1637− ElementKind::Label => "label",
1638− // Semantic elements
1639− ElementKind::Nav => "nav",
1640− ElementKind::Header => "header",
1641− ElementKind::Footer => "footer",
1642− ElementKind::Main => "main",
1643− ElementKind::Section => "section",
1644− ElementKind::Article => "article",
1645− ElementKind::Aside => "aside",
1646− // List
1647− ElementKind::List => {
1648− if elem.attrs.iter().any(|a| a.key == "ordered") {
1649− "ol"
1650− } else {
1651− "ul"
1652− }
1653− }
1654− ElementKind::ListItem => "li",
1655− // Table
1656− ElementKind::Table => "table",
1657− ElementKind::TableHead => "thead",
1658− ElementKind::TableBody => "tbody",
1659− ElementKind::TableRow => "tr",
1660− ElementKind::TableCell => "td",
1661− ElementKind::TableHeaderCell => "th",
1662− // Media
1663− ElementKind::Video => "video",
1664− ElementKind::Audio => "audio",
1665− // Additional semantic elements
1666− ElementKind::Form => "form",
1667− ElementKind::Details => "details",
1668− ElementKind::Summary => "summary",
1669− ElementKind::Blockquote => "blockquote",
1670− ElementKind::Cite => "cite",
1671− ElementKind::Code => "code",
1672− ElementKind::Pre => "pre",
1673− ElementKind::Figure => "figure",
1674− ElementKind::FigCaption => "figcaption",
1675− ElementKind::Progress => "progress",
1676− ElementKind::Meter => "meter",
1677− // New elements
1678− ElementKind::Dialog => "dialog",
1679− ElementKind::DefinitionList => "dl",
1680− ElementKind::DefinitionTerm => "dt",
1681− ElementKind::DefinitionDescription => "dd",
1682− ElementKind::Fieldset => "fieldset",
1683− ElementKind::Legend => "legend",
1684− ElementKind::Picture => "picture",
1685− ElementKind::Time => "time",
1686− ElementKind::Mark => "mark",
1687− ElementKind::Kbd => "kbd",
1688− ElementKind::Abbr => "abbr",
1689− ElementKind::Datalist => "datalist",
1690− ElementKind::Iframe => "iframe",
1691− ElementKind::Output => "output",
1692− ElementKind::Canvas => "canvas",
1693− ElementKind::Badge => "span",
1694− ElementKind::Tooltip => "span",
1695− ElementKind::Avatar => "div",
1696− ElementKind::Carousel => "div",
1697− ElementKind::Chip => "span",
1698− ElementKind::Tag => "span",
1699− ElementKind::Noscript => "noscript",
1700− ElementKind::Address => "address",
1701− ElementKind::Search => "search",
1702− ElementKind::Image
1703− | ElementKind::Input
1704− | ElementKind::HorizontalRule
1705− | ElementKind::Children
1706− | ElementKind::Slot(_)
1707− | ElementKind::Fragment
1708− | ElementKind::Source
1709− | ElementKind::Spacer
1710− | ElementKind::Script
1711− | ElementKind::Breadcrumb => unreachable!(),
1712− };
1713−
1714− let kind_label = match elem.kind {
1715− ElementKind::Row => "row",
1716− ElementKind::Column => "column",
1717− ElementKind::El => "el",
1718− ElementKind::Text => "text",
1719− ElementKind::Paragraph => "paragraph",
1720− ElementKind::Link => "link",
1721− ElementKind::Button => "button",
1722− ElementKind::Select => "select",
1723− ElementKind::Textarea => "textarea",
1724− ElementKind::Option => "option",
1725− ElementKind::Label => "label",
1726− ElementKind::Nav => "nav",
1727− ElementKind::Header => "header",
1728− ElementKind::Footer => "footer",
1729− ElementKind::Main => "main",
1730− ElementKind::Section => "section",
1731− ElementKind::Article => "article",
1732− ElementKind::Aside => "aside",
1733− ElementKind::List => "list",
1734− ElementKind::ListItem => "item",
1735− ElementKind::Table => "table",
1736− ElementKind::TableHead => "thead",
1737− ElementKind::TableBody => "tbody",
1738− ElementKind::TableRow => "tr",
1739− ElementKind::TableCell => "td",
1740− ElementKind::TableHeaderCell => "th",
1741− ElementKind::Video => "video",
1742− ElementKind::Audio => "audio",
1743− ElementKind::Form => "form",
1744− ElementKind::Details => "details",
1745− ElementKind::Summary => "summary",
1746− ElementKind::Blockquote => "blockquote",
1747− ElementKind::Cite => "cite",
1748− ElementKind::Code => "code",
1749− ElementKind::Pre => "pre",
1750− ElementKind::Figure => "figure",
1751− ElementKind::FigCaption => "figcaption",
1752− ElementKind::Fragment => "fragment",
1753− ElementKind::Dialog => "dialog",
1754− ElementKind::DefinitionList => "dl",
1755− ElementKind::DefinitionTerm => "dt",
1756− ElementKind::DefinitionDescription => "dd",
1757− ElementKind::Fieldset => "fieldset",
1758− ElementKind::Legend => "legend",
1759− ElementKind::Picture => "picture",
1760− ElementKind::Time => "time",
1761− ElementKind::Mark => "mark",
1762− ElementKind::Kbd => "kbd",
1763− ElementKind::Abbr => "abbr",
1764− ElementKind::Datalist => "datalist",
1765− ElementKind::Iframe => "iframe",
1766− ElementKind::Output => "output",
1767− ElementKind::Canvas => "canvas",
1768− ElementKind::Grid => "grid",
1769− ElementKind::Stack => "stack",
1770− ElementKind::Badge => "badge",
1771− ElementKind::Tooltip => "tooltip",
1772− ElementKind::Avatar => "avatar",
1773− ElementKind::Carousel => "carousel",
1774− ElementKind::Chip => "chip",
1775− ElementKind::Tag => "tag",
1776− ElementKind::Noscript => "noscript",
1777− ElementKind::Address => "address",
1778− ElementKind::Search => "search",
1379+ ElementKind::Tag(spec) => spec.html,
17791380 _ => "",
17801381 };
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();
17811388
17821389 // Track interactive elements for focus-visible CSS
1783− if matches!(
1784− elem.kind,
1785− ElementKind::Link
1786− | ElementKind::Button
1787− | ElementKind::Input
1788− | ElementKind::Select
1789− | ElementKind::Textarea
1790− ) {
1390+ if elem.kind == ElementKind::Link
1391+ || matches!(kind_label, "button" | "input" | "select" | "textarea")
1392+ {
17911393 ctx.has_interactive = true;
17921394 }
17931395
17941396 // Compute CSS for each state and get a class name
1795− 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();
17961399 let (id, user_class) = extract_id_class(&elem.attrs);
17971400
17981401 if ctx.dev && elem.line_num > 0 {
@@ -1806,95 +1409,9 @@ fn generate_element(
18061409 out.push('<');
18071410 out.push_str(tag);
18081411
1809− // @main gets id="hl-main" for skip-to-content link (unless user set an id)
1810− if elem.kind == ElementKind::Main && id.is_none() {
1811− out.push_str(" id=\"hl-main\"");
1812− }
1412+ emit_argument_attr(out, elem, ctx.in_picture);
18131413
1814− if elem.kind == ElementKind::Link
1815− && let Some(url) = &elem.argument
1816− {
1817− out.push_str(" href=\"");
1818− out.push_str(&html_escape(url));
1819− out.push('"');
1820− // Auto rel="noopener noreferrer" and target="_blank" for external links
1821− let is_external = url.starts_with("http://") || url.starts_with("https://");
1822− if is_external {
1823− let has_rel = elem.attrs.iter().any(|a| a.key == "rel");
1824− let has_target = elem.attrs.iter().any(|a| a.key == "target");
1825− if !has_rel {
1826− out.push_str(" rel=\"noopener noreferrer\"");
1827− }
1828− if !has_target {
1829− out.push_str(" target=\"_blank\"");
1830− }
1831− }
1832− }
1833−
1834− // Video/Audio src
1835− if matches!(elem.kind, ElementKind::Video | ElementKind::Audio)
1836− && let Some(src) = &elem.argument
1837− {
1838− out.push_str(" src=\"");
1839− out.push_str(&html_escape(src));
1840− out.push('"');
1841− }
1842−
1843− // Form action
1844− if elem.kind == ElementKind::Form
1845− && let Some(action) = &elem.argument
1846− {
1847− out.push_str(" action=\"");
1848− out.push_str(&html_escape(action));
1849− out.push('"');
1850− }
1851−
1852− // Iframe src
1853− if elem.kind == ElementKind::Iframe
1854− && let Some(src) = &elem.argument
1855− {
1856− out.push_str(" src=\"");
1857− out.push_str(&html_escape(src));
1858− out.push('"');
1859− }
1860−
1861− // Tooltip title
1862− if elem.kind == ElementKind::Tooltip
1863− && let Some(text) = &elem.argument
1864− {
1865− out.push_str(" title=\"");
1866− out.push_str(&html_escape(text));
1867− out.push('"');
1868− }
1869−
1870− // Time datetime
1871− if elem.kind == ElementKind::Time
1872− && let Some(dt) = elem.attrs.iter().find(|a| a.key == "datetime")
1873− && let Some(val) = &dt.value
1874− {
1875− out.push_str(" datetime=\"");
1876− out.push_str(&html_escape(val));
1877− out.push('"');
1878− }
1879−
1880− // Critical CSS: inline styles directly instead of using a class
1881− let is_critical = elem.attrs.iter().any(|a| a.key == "critical");
1882− if is_critical {
1883− let inline_css = attrs_to_css(&elem.attrs, "", &elem.kind, parent_kind);
1884− if !inline_css.is_empty() {
1885− out.push_str(" style=\"");
1886− out.push_str(&html_escape(&inline_css));
1887− out.push('"');
1888− }
1889− // Still use class for non-base styles (pseudo, responsive, etc.)
1890− if gen_class.as_deref().is_some_and(|c| !c.is_empty()) {
1891− emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
1892− } else if let Some(ref uc) = user_class {
1893− emit_class_attr(out, None, Some(uc));
1894− }
1895− } else {
1896− emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
1897− }
1414+ emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
18981415
18991416 if let Some(id) = id {
19001417 out.push_str(" id=\"");
@@ -1902,7 +1419,7 @@ fn generate_element(
19021419 out.push('"');
19031420 }
19041421
1905− emit_html_passthrough_attrs(out, &elem.attrs);
1422+ emit_html_attrs(out, &elem.attrs);
19061423
19071424 // Source map attributes in dev mode
19081425 if ctx.dev && elem.line_num > 0 {
@@ -1913,51 +1430,27 @@ fn generate_element(
19131430 }
19141431
19151432 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");
19161438 out.push_str(ctx.nl());
19171439
1918− // Inline text argument
1919− if matches!(
1920− elem.kind,
1921− ElementKind::Text
1922− | ElementKind::Button
1923− | ElementKind::Label
1924− | ElementKind::Option
1925− | ElementKind::Textarea
1926− | ElementKind::ListItem
1927− | ElementKind::TableCell
1928− | ElementKind::TableHeaderCell
1929− | ElementKind::Summary
1930− | ElementKind::Cite
1931− | ElementKind::Code
1932− | ElementKind::FigCaption
1933− | ElementKind::Legend
1934− | ElementKind::DefinitionTerm
1935− | ElementKind::Mark
1936− | ElementKind::Kbd
1937− | ElementKind::Abbr
1938− | ElementKind::Time
1939− | ElementKind::DefinitionDescription
1940− | ElementKind::Badge
1941− | ElementKind::Tooltip
1942− | ElementKind::Chip
1943− | ElementKind::Tag
1944− ) && let Some(text) = &elem.argument
1945− {
1946− out.push_str(&html_escape(text));
1947− }
1948−
1949− // Children
1440+ let layout = elem.kind.layout();
19501441 ctx.depth += 1;
1951− let is_paragraph = elem.kind == ElementKind::Paragraph;
1952− for (i, child) in elem.children.iter().enumerate() {
1953− generate_node(child, Some(&elem.kind), out, styles, ctx);
1954− if is_paragraph && i < elem.children.len() - 1 {
1955− out.push(' ');
1956− }
1957− }
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;
19581450 ctx.depth -= 1;
19591451
19601452 out.push_str(&ctx.indent());
1453+ ctx.dev = outer_dev;
19611454 out.push_str("</");
19621455 out.push_str(tag);
19631456 out.push('>');
@@ -1966,21 +1459,18 @@ fn generate_element(
19661459
19671460fn generate_self_closing(
19681461 elem: &Element,
1969− parent_kind: Option<&ElementKind>,
1462+ parent: Option<Layout>,
19701463 out: &mut String,
19711464 styles: &mut StyleCollector,
19721465 ctx: &mut GenContext,
19731466) {
1974− 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);
19751468 let (id, user_class) = extract_id_class(&elem.attrs);
19761469
1977− let (tag, kind_label) = match elem.kind {
1470+ let (tag, kind_label) = match &elem.kind {
19781471 ElementKind::Image => ("img", "image"),
1979− ElementKind::Input => ("input", "input"),
1980− ElementKind::HorizontalRule => ("hr", "hr"),
1981− ElementKind::Source => ("source", "source"),
1982− ElementKind::Spacer => ("div", "spacer"),
1983− _ => unreachable!(),
1472+ ElementKind::Tag(spec) => (spec.html, spec.name),
1473+ _ => unreachable!("not a void element: {:?}", elem.kind),
19841474 };
19851475
19861476 if ctx.dev && elem.line_num > 0 {
@@ -1993,43 +1483,7 @@ fn generate_self_closing(
19931483 out.push_str(&ctx.indent());
19941484 out.push('<');
19951485 out.push_str(tag);
1996−
1997− // Image src (with optional non-SVG base64 inlining)
1998− if elem.kind == ElementKind::Image {
1999− let src = elem.argument.as_deref().unwrap_or("");
2000− let is_inline = elem.attrs.iter().any(|a| a.key == "inline");
2001− if is_inline && !src.is_empty() && !src.ends_with(".svg") {
2002− let mime = if src.ends_with(".png") {
2003− "image/png"
2004− } else if src.ends_with(".jpg") || src.ends_with(".jpeg") {
2005− "image/jpeg"
2006− } else if src.ends_with(".gif") {
2007− "image/gif"
2008− } else if src.ends_with(".webp") {
2009− "image/webp"
2010− } else if src.ends_with(".avif") {
2011− "image/avif"
2012− } else {
2013− "application/octet-stream"
2014− };
2015− if let Ok(data) = std::fs::read(src) {
2016− let b64 = base64_encode(&data);
2017− out.push_str(" src=\"data:");
2018− out.push_str(mime);
2019− out.push_str(";base64,");
2020− out.push_str(&b64);
2021− out.push('"');
2022− } else {
2023− out.push_str(" src=\"");
2024− out.push_str(&html_escape(src));
2025− out.push('"');
2026− }
2027− } else {
2028− out.push_str(" src=\"");
2029− out.push_str(&html_escape(src));
2030− out.push('"');
2031− }
2032− }
1486+ emit_argument_attr(out, elem, ctx.in_picture);
20331487
20341488 emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
20351489
@@ -2039,7 +1493,7 @@ fn generate_self_closing(
20391493 out.push('"');
20401494 }
20411495
2042− emit_html_passthrough_attrs(out, &elem.attrs);
1496+ emit_html_attrs(out, &elem.attrs);
20431497
20441498 // Source map attributes in dev mode (self-closing)
20451499 if ctx.dev && elem.line_num > 0 {
@@ -2049,93 +1503,6 @@ fn generate_self_closing(
20491503 ));
20501504 }
20511505
2052− // Image optimization: auto-add loading="lazy" and decoding="async"
2053− if elem.kind == ElementKind::Image {
2054− // SVG inlining: @image [inline] logo.svg
2055− if elem.attrs.iter().any(|a| a.key == "inline")
2056− && let Some(src) = &elem.argument
2057− && src.ends_with(".svg")
2058− && let Ok(svg_content) = std::fs::read_to_string(src)
2059− {
2060− // Close the tag we opened, then emit inline SVG instead
2061− out.truncate(out.rfind('<').unwrap_or(0));
2062− out.push_str(&ctx.indent());
2063− out.push_str(svg_content.trim());
2064− out.push_str(ctx.nl());
2065− return;
2066− }
2067− // Responsive srcset: @image photo.jpg [responsive 400 800 1200]
2068− let responsive_attr = elem.attrs.iter().find(|a| a.key == "responsive");
2069− if let Some(resp) = responsive_attr
2070− && let Some(ref sizes_str) = resp.value
2071− {
2072− let widths: Vec<&str> = sizes_str.split_whitespace().collect();
2073− if !widths.is_empty() {
2074− let src = elem.argument.as_deref().unwrap_or("");
2075− if !src.is_empty() {
2076− // Generate srcset with width descriptors
2077− // Convention: file-{width}.ext (e.g., photo-400.jpg)
2078− let dot_pos = src.rfind('.').unwrap_or(src.len());
2079− let base = &src[..dot_pos];
2080− let ext = &src[dot_pos..];
2081− let mut srcset_parts = Vec::new();
2082− for w in &widths {
2083− srcset_parts.push(format!("{}-{}{} {}w", base, w, ext, w));
2084− }
2085− out.push_str(" srcset=\"");
2086− out.push_str(&srcset_parts.join(", "));
2087− out.push('"');
2088− // Generate sizes attribute
2089− let max_width = widths.last().unwrap_or(&"100vw");
2090− out.push_str(&format!(
2091− " sizes=\"(max-width: {}px) 100vw, {}px\"",
2092− max_width, max_width
2093− ));
2094− }
2095− }
2096− }
2097−
2098− // Auto image dimensions: read local image file to inject width/height + aspect-ratio
2099− let has_width = elem.attrs.iter().any(|a| a.key == "width");
2100− let has_height = elem.attrs.iter().any(|a| a.key == "height");
2101− if (!has_width || !has_height)
2102− && let Some(ref src) = elem.argument
2103− && !src.starts_with("http://")
2104− && !src.starts_with("https://")
2105− && !src.starts_with("data:")
2106− && let Some((w, h)) = read_image_dimensions(src)
2107− {
2108− if !has_width {
2109− out.push_str(&format!(" width=\"{}\"", w));
2110− }
2111− if !has_height {
2112− out.push_str(&format!(" height=\"{}\"", h));
2113− }
2114− // Auto aspect-ratio to prevent CLS
2115− if !elem.attrs.iter().any(|a| a.key == "aspect-ratio") {
2116− out.push_str(&format!(" style=\"aspect-ratio:{}/{}\"", w, h));
2117− }
2118− }
2119−
2120− // Smart image loading: first 3 images get fetchpriority="high" (above the fold),
2121− // subsequent images get loading="lazy" + decoding="async"
2122− ctx.image_count += 1;
2123− if ctx.image_count <= 3 {
2124− // Above-the-fold: eager loading with high priority
2125− if !elem.attrs.iter().any(|a| a.key == "fetchpriority") {
2126− out.push_str(" fetchpriority=\"high\"");
2127− }
2128− } else {
2129− // Below-the-fold: lazy loading
2130− if !elem.attrs.iter().any(|a| a.key == "loading") {
2131− out.push_str(" loading=\"lazy\"");
2132− }
2133− if !elem.attrs.iter().any(|a| a.key == "decoding") {
2134− out.push_str(" decoding=\"async\"");
2135− }
2136− }
2137− }
2138−
21391506 out.push('>');
21401507 out.push_str(ctx.nl());
21411508}
@@ -2151,7 +1518,10 @@ fn generate_text_segments(
21511518 TextSegment::Plain(text) => out.push_str(&html_escape(text)),
21521519 TextSegment::Inline(elem) => {
21531520 let mut buf = String::new();
2154− 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;
21551525 out.push_str(buf.trim_end());
21561526 }
21571527 }
@@ -2164,111 +1534,183 @@ fn generate_text_segments(
21641534
21651535fn compute_class(
21661536 attrs: &[Attribute],
2167− kind: &ElementKind,
2168− parent_kind: Option<&ElementKind>,
1537+ site: &Site,
21691538 styles: &mut StyleCollector,
1539+ distinct: String,
21701540) -> Option<String> {
2171− let base = attrs_to_css(attrs, "", kind, parent_kind);
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);
1547+ }
1548+ }
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+}
21721572
2173− // Collect pseudo-state overrides
2174− let mut pseudo = Vec::new();
2175− for &(prefix, selector) in PSEUDO_PREFIXES {
2176− let css = attrs_to_css(attrs, prefix, kind, parent_kind);
2177− if !css.is_empty() {
2178− pseudo.push((selector.to_string(), css));
2179− }
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;");
21801581 }
2181−
2182− // Auto-add ::-webkit-scrollbar pseudo for no-scrollbar attribute
2183− if attrs.iter().any(|a| a.key == "no-scrollbar") {
2184− pseudo.push((
2185− "::-webkit-scrollbar".to_string(),
2186− "display:none;".to_string(),
2187− ));
1582+ if !site.root {
1583+ css.push_str(layout_css(site.kind.layout(), site.inline));
21881584 }
1585+ css.push_str(site.kind.css());
1586+ css
1587+}
21891588
2190− // Collect nth:EXPR: dynamic pseudo selectors
2191− let mut nth_prefixes: Vec<String> = Vec::new();
2192− for attr in attrs {
2193− if attr.key.starts_with("nth:") {
2194− let rest = &attr.key[4..];
2195− if let Some(colon_pos) = rest.find(':') {
2196− let prefix = format!("nth:{}:", &rest[..colon_pos]);
2197− if !nth_prefixes.contains(&prefix) {
2198− nth_prefixes.push(prefix);
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;
1597+ }
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;
21991612 }
1613+ _ => {}
22001614 }
22011615 }
2202− }
2203− for prefix in &nth_prefixes {
2204− let expr = &prefix[4..prefix.len() - 1];
2205− let selector = format!(":nth-child({})", expr);
2206− let css = attrs_to_css(attrs, prefix, kind, parent_kind);
2207− if !css.is_empty() {
2208− pseudo.push((selector, css));
2209− }
2210− }
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+ })
1621+}
22111622
2212− // Collect has(...): dynamic pseudo selectors
2213− let mut has_prefixes: Vec<String> = Vec::new();
2214− for attr in attrs {
2215− if attr.key.starts_with("has(")
2216− && let Some(close) = attr.key.find("):")
2217− {
2218− let prefix = format!("{}:", &attr.key[..close + 1]);
2219− if !has_prefixes.contains(&prefix) {
2220− has_prefixes.push(prefix);
1623+/// Dedupe CSS declarations within a single rule body: for any property
1624+/// declared more than once, keep only the last occurrence. Unparseable
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.
1628+fn dedupe_declarations(css: &str) -> String {
1629+ if css.is_empty() {
1630+ return String::new();
1631+ }
1632+ // Quick path: no chance of duplicates if there's fewer than 2 declarations.
1633+ if css.matches(';').count() < 2 {
1634+ return css.to_string();
1635+ }
1636+
1637+ // Split into (property_name_opt, full_decl_with_semi) preserving whatever
1638+ // terminator the input used. We split on `;` at depth 0 (ignoring parens).
1639+ let mut decls: Vec<(Option<String>, String)> = Vec::new();
1640+ let mut current = String::new();
1641+ 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;
1646+ for ch in css.chars() {
1647+ if escaped {
1648+ escaped = false;
1649+ current.push(ch);
1650+ } else if ch == '\\' {
1651+ escaped = true;
1652+ current.push(ch);
1653+ } else if let Some(q) = quote {
1654+ if ch == q {
1655+ quote = None;
1656+ }
1657+ current.push(ch);
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();
22211678 }
1679+ } else {
1680+ current.push(ch);
22221681 }
22231682 }
2224− for prefix in &has_prefixes {
2225− let inner = &prefix[4..prefix.len() - 2]; // extract selector from has(selector):
2226− let selector = format!(":has({})", inner);
2227− let css = attrs_to_css(attrs, prefix, kind, parent_kind);
2228− if !css.is_empty() {
2229− pseudo.push((selector, css));
2230− }
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)));
22311688 }
22321689
2233− // Collect responsive overrides
2234− let mut responsive = Vec::new();
2235− for &(bp_name, _) in BREAKPOINTS {
2236− let prefix = format!("{}:", bp_name);
2237− let css = attrs_to_css(attrs, &prefix, kind, parent_kind);
2238− if !css.is_empty() {
2239− responsive.push((bp_name.to_string(), css));
2240− }
1690+ if decls.len() < 2 {
1691+ return css.to_string();
22411692 }
22421693
2243− // Collect container query overrides
2244− let mut container = Vec::new();
2245− for &(bp_name, _) in BREAKPOINTS {
2246− let prefix = format!("cq-{}:", bp_name);
2247− let css = attrs_to_css(attrs, &prefix, kind, parent_kind);
2248− if !css.is_empty() {
2249− container.push((bp_name.to_string(), css));
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);
22501700 }
22511701 }
22521702
2253− let dark = attrs_to_css(attrs, "dark:", kind, parent_kind);
2254− let print = attrs_to_css(attrs, "print:", kind, parent_kind);
2255− let motion_safe = attrs_to_css(attrs, "motion-safe:", kind, parent_kind);
2256− let motion_reduce = attrs_to_css(attrs, "motion-reduce:", kind, parent_kind);
2257− let landscape = attrs_to_css(attrs, "landscape:", kind, parent_kind);
2258− let portrait = attrs_to_css(attrs, "portrait:", kind, parent_kind);
2259−
2260− styles.get_class(
2261− base,
2262− pseudo,
2263− responsive,
2264− dark,
2265− print,
2266− motion_safe,
2267− motion_reduce,
2268− landscape,
2269− portrait,
2270− container,
2271− )
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
22721714}
22731715
22741716fn emit_class_attr(out: &mut String, gen_class: Option<&str>, user_class: Option<&str>) {
@@ -2281,1218 +1723,595 @@ fn emit_class_attr(out: &mut String, gen_class: Option<&str>, user_class: Option
22811723 out.push('"');
22821724 }
22831725 (Some(g), None) => {
2284− out.push_str(" class=\"");
2285− out.push_str(g);
2286− out.push('"');
2287− }
2288− (None, Some(u)) => {
2289− out.push_str(" class=\"");
2290− out.push_str(&html_escape(u));
2291− out.push('"');
2292− }
2293− (None, None) => {}
2294− }
2295−}
2296−
2297−// ---------------------------------------------------------------------------
2298−// Attribute → CSS mapping
2299−// ---------------------------------------------------------------------------
2300−
2301−/// (htmlang prefix, CSS selector suffix)
2302−const PSEUDO_PREFIXES: &[(&str, &str)] = &[
2303− ("hover:", ":hover"),
2304− ("active:", ":active"),
2305− ("focus:", ":focus"),
2306− ("focus-visible:", ":focus-visible"),
2307− ("focus-within:", ":focus-within"),
2308− ("disabled:", ":disabled"),
2309− ("checked:", ":checked"),
2310− ("placeholder:", "::placeholder"),
2311− ("first:", ":first-child"),
2312− ("last:", ":last-child"),
2313− ("odd:", ":nth-child(odd)"),
2314− ("even:", ":nth-child(even)"),
2315− ("before:", "::before"),
2316− ("after:", "::after"),
2317− ("selection:", "::selection"),
2318− ("visited:", ":visited"),
2319− ("empty:", ":empty"),
2320− ("target:", ":target"),
2321− ("valid:", ":valid"),
2322− ("invalid:", ":invalid"),
2323−];
2324−const RESPONSIVE_PREFIXES: &[&str] = &["sm:", "md:", "lg:", "xl:", "2xl:"];
2325−const MEDIA_PREFIXES: &[&str] = &[
2326− "dark:",
2327− "print:",
2328− "motion-safe:",
2329− "motion-reduce:",
2330− "landscape:",
2331− "portrait:",
2332−];
2333−const CONTAINER_QUERY_PREFIXES: &[&str] = &["cq-sm:", "cq-md:", "cq-lg:", "cq-xl:", "cq-2xl:"];
2334−
2335−fn is_prefixed_attr(key: &str) -> bool {
2336− PSEUDO_PREFIXES.iter().any(|&(p, _)| key.starts_with(p))
2337− || RESPONSIVE_PREFIXES.iter().any(|p| key.starts_with(p))
2338− || MEDIA_PREFIXES.iter().any(|p| key.starts_with(p))
2339− || CONTAINER_QUERY_PREFIXES.iter().any(|p| key.starts_with(p))
2340− || key.starts_with("nth:")
2341− || key.starts_with("has(")
2342−}
2343−
2344−fn attrs_to_css(
2345− attrs: &[Attribute],
2346− state_prefix: &str,
2347− kind: &ElementKind,
2348− parent_kind: Option<&ElementKind>,
2349−) -> String {
2350− let mut css = String::new();
2351−
2352− // Base element styles only for the default (non-state) pass
2353− if state_prefix.is_empty() {
2354− match kind {
2355− ElementKind::Row => css.push_str("display:flex;flex-direction:row;"),
2356− ElementKind::Column => css.push_str("display:flex;flex-direction:column;"),
2357− ElementKind::El => css.push_str("display:flex;flex-direction:column;"),
2358− ElementKind::Paragraph => css.push_str("margin:0;"),
2359− // Semantic elements get flex column layout like @el
2360− ElementKind::Nav | ElementKind::Header | ElementKind::Footer
2361− | ElementKind::Main | ElementKind::Section | ElementKind::Article
2362− | ElementKind::Aside => css.push_str("display:flex;flex-direction:column;"),
2363− // Lists: reset browser defaults
2364− ElementKind::List => css.push_str("margin:0;padding-left:0;list-style:none;"),
2365− ElementKind::ListItem => css.push_str("display:flex;flex-direction:column;"),
2366− // Form: flex column like @el
2367− ElementKind::Form => css.push_str("display:flex;flex-direction:column;"),
2368− // Details: flex column
2369− ElementKind::Details => css.push_str("display:flex;flex-direction:column;"),
2370− // Figure: flex column
2371− ElementKind::Figure => css.push_str("display:flex;flex-direction:column;margin:0;"),
2372− // Blockquote: flex column, reset browser margin
2373− ElementKind::Blockquote => css.push_str("display:flex;flex-direction:column;margin:0;"),
2374− // Pre: preserve whitespace
2375− ElementKind::Pre => css.push_str("margin:0;white-space:pre;font-family:ui-monospace,monospace;"),
2376− // Code: monospace font
2377− ElementKind::Code => css.push_str("font-family:ui-monospace,monospace;"),
2378− // New elements
2379− ElementKind::Dialog => css.push_str("display:flex;flex-direction:column;"),
2380− ElementKind::DefinitionList => css.push_str("margin:0;"),
2381− ElementKind::DefinitionDescription => css.push_str("margin:0;display:flex;flex-direction:column;"),
2382− ElementKind::Fieldset => css.push_str("display:flex;flex-direction:column;border:1px solid currentColor;padding:0.5em;margin:0;"),
2383− ElementKind::Kbd => css.push_str("font-family:ui-monospace,monospace;"),
2384− ElementKind::Grid => css.push_str("display:grid;"),
2385− ElementKind::Stack => css.push_str("position:relative;"),
2386− 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;"),
2387− ElementKind::Tooltip => css.push_str("position:relative;cursor:help;"),
2388− ElementKind::Spacer => css.push_str("flex:1;"),
2389− ElementKind::Avatar => css.push_str("display:inline-flex;align-items:center;justify-content:center;border-radius:9999px;overflow:hidden;flex-shrink:0;"),
2390− 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;"),
2391− 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;"),
2392− ElementKind::Tag => css.push_str("display:inline-flex;align-items:center;padding:2px 8px;border-radius:4px;font-size:0.75rem;font-weight:600;"),
2393− _ => {}
2394− }
2395− // Children of @carousel get scroll-snap-align and flex-shrink
2396− if matches!(parent_kind, Some(ElementKind::Carousel)) {
2397− css.push_str("scroll-snap-align:start;flex-shrink:0;");
2398− }
2399− }
2400−
2401− for attr in attrs {
2402− // Determine the effective key for this pass
2403− let effective_key = if state_prefix.is_empty() {
2404− if is_prefixed_attr(&attr.key) {
2405− continue;
2406− }
2407− attr.key.as_str()
2408− } else {
2409− match attr.key.strip_prefix(state_prefix) {
2410− Some(k) => k,
2411− None => continue,
2412− }
2413− };
2414−
2415− let val = attr.value.as_deref();
2416−
2417− match effective_key {
2418− // Layout
2419− "spacing" | "gap" => {
2420− if let Some(v) = val {
2421− push_css(&mut css, "gap", &css_px(v));
2422− }
2423− }
2424− "padding" => {
2425− if let Some(v) = val {
2426− push_css(&mut css, "padding", &css_px_multi(v));
2427− }
2428− }
2429− "padding-x" => {
2430− if let Some(v) = val {
2431− push_css(&mut css, "padding-left", &css_px(v));
2432− push_css(&mut css, "padding-right", &css_px(v));
2433− }
2434− }
2435− "padding-y" => {
2436− if let Some(v) = val {
2437− push_css(&mut css, "padding-top", &css_px(v));
2438− push_css(&mut css, "padding-bottom", &css_px(v));
2439− }
2440− }
2441−
2442− // Sizing
2443− "width" => {
2444− if let Some(v) = val {
2445− match v {
2446− "fill" => match parent_kind {
2447− Some(ElementKind::Row) => {
2448− push_css(&mut css, "flex", "1");
2449− push_css(&mut css, "min-width", "0");
2450− }
2451− _ => push_css(&mut css, "width", "100%"),
2452− },
2453− "shrink" => push_css(&mut css, "flex-shrink", "0"),
2454− _ => push_css(&mut css, "width", &css_px(v)),
2455− }
2456− }
2457− }
2458− "height" => {
2459− if let Some(v) = val {
2460− match v {
2461− "fill" => match parent_kind {
2462− Some(ElementKind::Column) => {
2463− push_css(&mut css, "flex", "1");
2464− push_css(&mut css, "min-height", "0");
2465− }
2466− _ => push_css(&mut css, "height", "100%"),
2467− },
2468− "shrink" => push_css(&mut css, "flex-shrink", "0"),
2469− _ => push_css(&mut css, "height", &css_px(v)),
2470− }
2471− }
2472− }
2473− "min-width" => {
2474− if let Some(v) = val {
2475− push_css(&mut css, "min-width", &css_px(v));
2476− }
2477− }
2478− "max-width" => {
2479− if let Some(v) = val {
2480− push_css(&mut css, "max-width", &css_px(v));
2481− }
2482− }
2483− "min-height" => {
2484− if let Some(v) = val {
2485− push_css(&mut css, "min-height", &css_px(v));
2486− }
2487− }
2488− "max-height" => {
2489− if let Some(v) = val {
2490− push_css(&mut css, "max-height", &css_px(v));
2491− }
2492− }
2493−
2494− // Alignment
2495− "center-x" => match parent_kind {
2496− Some(ElementKind::Column) | Some(ElementKind::El) => {
2497− push_css(&mut css, "align-self", "center");
2498− }
2499− _ => {
2500− push_css(&mut css, "margin-left", "auto");
2501− push_css(&mut css, "margin-right", "auto");
2502− }
2503− },
2504− "center-y" => match parent_kind {
2505− Some(ElementKind::Row) => push_css(&mut css, "align-self", "center"),
2506− _ => {
2507− push_css(&mut css, "margin-top", "auto");
2508− push_css(&mut css, "margin-bottom", "auto");
2509− }
2510− },
2511− "align-left" => match parent_kind {
2512− Some(ElementKind::Column) | Some(ElementKind::El) => {
2513− push_css(&mut css, "align-self", "flex-start");
2514− }
2515− _ => push_css(&mut css, "margin-right", "auto"),
2516− },
2517− "align-right" => match parent_kind {
2518− Some(ElementKind::Column) | Some(ElementKind::El) => {
2519− push_css(&mut css, "align-self", "flex-end");
2520− }
2521− _ => push_css(&mut css, "margin-left", "auto"),
2522− },
2523− "align-top" => match parent_kind {
2524− Some(ElementKind::Row) => push_css(&mut css, "align-self", "flex-start"),
2525− _ => push_css(&mut css, "margin-bottom", "auto"),
2526− },
2527− "align-bottom" => match parent_kind {
2528− Some(ElementKind::Row) => push_css(&mut css, "align-self", "flex-end"),
2529− _ => push_css(&mut css, "margin-top", "auto"),
2530− },
2531−
2532− // Style
2533− "background" => {
2534− if let Some(v) = val {
2535− push_css(&mut css, "background", v);
2536− }
2537− }
2538− "color" => {
2539− if let Some(v) = val {
2540− push_css(&mut css, "color", v);
2541− }
2542− }
2543− "border" => {
2544− if let Some(v) = val {
2545− let parts: Vec<&str> = v.splitn(2, ' ').collect();
2546− if parts.len() == 2 {
2547− push_css(
2548− &mut css,
2549− "border",
2550− &format!("{} solid {}", css_px(parts[0]), parts[1]),
2551− );
2552− } else {
2553− push_css(
2554− &mut css,
2555− "border",
2556− &format!("{} solid currentColor", css_px(parts[0])),
2557− );
2558− }
2559− }
2560− }
2561− "border-top" | "border-bottom" | "border-left" | "border-right" => {
2562− if let Some(v) = val {
2563− let parts: Vec<&str> = v.splitn(2, ' ').collect();
2564− if parts.len() == 2 {
2565− push_css(
2566− &mut css,
2567− effective_key,
2568− &format!("{} solid {}", css_px(parts[0]), parts[1]),
2569− );
2570− } else {
2571− push_css(
2572− &mut css,
2573− effective_key,
2574− &format!("{} solid currentColor", css_px(parts[0])),
2575− );
2576− }
2577− }
2578− }
2579− "rounded" => {
2580− if let Some(v) = val {
2581− push_css(&mut css, "border-radius", &css_px(v));
2582− }
2583− }
2584− "bold" => push_css(&mut css, "font-weight", "bold"),
2585− "italic" => push_css(&mut css, "font-style", "italic"),
2586− "underline" => push_css(&mut css, "text-decoration", "underline"),
2587− "size" => {
2588− if let Some(v) = val {
2589− push_css(&mut css, "font-size", &css_px(v));
2590− }
2591− }
2592− "font" => {
2593− if let Some(v) = val {
2594− push_css(&mut css, "font-family", v);
2595− }
2596− }
2597− "transition" => {
2598− if let Some(v) = val {
2599− push_css(&mut css, "transition", v);
2600− }
2601− }
2602− "cursor" => {
2603− if let Some(v) = val {
2604− push_css(&mut css, "cursor", v);
2605− }
2606− }
2607− "opacity" => {
2608− if let Some(v) = val {
2609− push_css(&mut css, "opacity", v);
2610− }
2611− }
2612−
2613− // Typography
2614− "text-align" => {
2615− if let Some(v) = val {
2616− push_css(&mut css, "text-align", v);
2617− }
2618− }
2619− "line-height" => {
2620− if let Some(v) = val {
2621− push_css(&mut css, "line-height", v);
2622− }
2623− }
2624− "letter-spacing" => {
2625− if let Some(v) = val {
2626− push_css(&mut css, "letter-spacing", &css_px(v));
2627− }
2628− }
2629− "text-transform" => {
2630− if let Some(v) = val {
2631− push_css(&mut css, "text-transform", v);
2632− }
2633− }
2634− "white-space" => {
2635− if let Some(v) = val {
2636− push_css(&mut css, "white-space", v);
2637− }
2638− }
2639−
2640− // Overflow & positioning
2641− "overflow" => {
2642− if let Some(v) = val {
2643− push_css(&mut css, "overflow", v);
2644− }
2645− }
2646− "position" => {
2647− if let Some(v) = val {
2648− push_css(&mut css, "position", v);
2649− }
2650− }
2651− "top" => {
2652− if let Some(v) = val {
2653− push_css(&mut css, "top", &css_px(v));
2654− }
2655− }
2656− "right" => {
2657− if let Some(v) = val {
2658− push_css(&mut css, "right", &css_px(v));
2659− }
2660− }
2661− "bottom" => {
2662− if let Some(v) = val {
2663− push_css(&mut css, "bottom", &css_px(v));
2664− }
2665− }
2666− "left" => {
2667− if let Some(v) = val {
2668− push_css(&mut css, "left", &css_px(v));
2669− }
2670− }
2671− "z-index" => {
2672− if let Some(v) = val {
2673− push_css(&mut css, "z-index", v);
2674− }
2675− }
2676−
2677− // Display & visibility
2678− "display" => {
2679− if let Some(v) = val {
2680− push_css(&mut css, "display", v);
2681− }
2682− }
2683− "visibility" => {
2684− if let Some(v) = val {
2685− push_css(&mut css, "visibility", v);
2686− }
2687− }
2688− "hidden" => push_css(&mut css, "display", "none"),
2689−
2690− // Transform & filters
2691− "transform" => {
2692− if let Some(v) = val {
2693− push_css(&mut css, "transform", v);
2694− }
2695− }
2696− "backdrop-filter" => {
2697− if let Some(v) = val {
2698− push_css(&mut css, "backdrop-filter", v);
2699− }
2700− }
2701−
2702− // Effects
2703− "shadow" => {
2704− if let Some(v) = val {
2705− push_css(&mut css, "box-shadow", v);
2706− }
2707− }
2708−
2709− // Flow
2710− "wrap" => push_css(&mut css, "flex-wrap", "wrap"),
2711− "gap-x" => {
2712− if let Some(v) = val {
2713− push_css(&mut css, "column-gap", &css_px(v));
2714− }
2715− }
2716− "gap-y" => {
2717− if let Some(v) = val {
2718− push_css(&mut css, "row-gap", &css_px(v));
2719− }
2720− }
2721−
2722− // Grid
2723− "grid" => {
2724− push_css(&mut css, "display", "grid");
2725− }
2726− "grid-cols" => {
2727− if let Some(v) = val {
2728− if let Ok(n) = v.parse::<u32>() {
2729− push_css(
2730− &mut css,
2731− "grid-template-columns",
2732− &format!("repeat({},1fr)", n),
2733− );
2734− } else {
2735− push_css(&mut css, "grid-template-columns", v);
2736− }
2737− }
2738− }
2739− "grid-rows" => {
2740− if let Some(v) = val {
2741− if let Ok(n) = v.parse::<u32>() {
2742− push_css(
2743− &mut css,
2744− "grid-template-rows",
2745− &format!("repeat({},1fr)", n),
2746− );
2747− } else {
2748− push_css(&mut css, "grid-template-rows", v);
2749− }
2750− }
2751− }
2752− "col-span" => {
2753− if let Some(v) = val {
2754− push_css(&mut css, "grid-column", &format!("span {}", v));
2755− }
2756− }
2757− "row-span" => {
2758− if let Some(v) = val {
2759− push_css(&mut css, "grid-row", &format!("span {}", v));
2760− }
2761− }
2762−
2763− // Animation
2764− "animation" => {
2765− if let Some(v) = val {
2766− push_css(&mut css, "animation", v);
2767− }
2768− }
2769−
2770− // Aspect ratio
2771− "aspect-ratio" => {
2772− if let Some(v) = val {
2773− push_css(&mut css, "aspect-ratio", v);
2774− }
2775− }
2776−
2777− // CSS containment for rendering performance
2778− "contain" => {
2779− if let Some(v) = val {
2780− push_css(&mut css, "contain", v);
2781− } else {
2782− push_css(&mut css, "contain", "layout style paint");
2783− }
2784− }
2785− "content-visibility" => {
2786− if let Some(v) = val {
2787− push_css(&mut css, "content-visibility", v);
2788− } else {
2789− push_css(&mut css, "content-visibility", "auto");
2790− }
2791− }
2792−
2793− // Outline (like border but doesn't affect layout)
2794− "outline" => {
2795− if let Some(v) = val {
2796− let parts: Vec<&str> = v.splitn(2, ' ').collect();
2797− if parts.len() == 2 {
2798− push_css(
2799− &mut css,
2800− "outline",
2801− &format!("{} solid {}", css_px(parts[0]), parts[1]),
2802− );
2803− } else {
2804− push_css(
2805− &mut css,
2806− "outline",
2807− &format!("{} solid currentColor", css_px(parts[0])),
2808− );
2809− }
2810− }
2811− }
2812−
2813− // Logical properties (i18n-aware)
2814− "padding-inline" => {
2815− if let Some(v) = val {
2816− push_css(&mut css, "padding-inline", &css_px_multi(v));
2817− }
2818− }
2819− "padding-block" => {
2820− if let Some(v) = val {
2821− push_css(&mut css, "padding-block", &css_px_multi(v));
2822− }
2823− }
2824− "margin-inline" => {
2825− if let Some(v) = val {
2826− push_css(&mut css, "margin-inline", &css_px_multi(v));
2827− }
2828− }
2829− "margin-block" => {
2830− if let Some(v) = val {
2831− push_css(&mut css, "margin-block", &css_px_multi(v));
2832− }
2833− }
2834−
2835− // Logical property start/end variants
2836− "padding-inline-start"
2837− | "padding-inline-end"
2838− | "padding-block-start"
2839− | "padding-block-end"
2840− | "margin-inline-start"
2841− | "margin-inline-end"
2842− | "margin-block-start"
2843− | "margin-block-end" => {
2844− if let Some(v) = val {
2845− push_css(&mut css, effective_key, &css_px(v));
2846− }
2847− }
2848−
2849− // Logical inset
2850− "inset-inline" | "inset-block" => {
2851− if let Some(v) = val {
2852− push_css(&mut css, effective_key, &css_px_multi(v));
2853− }
2854− }
2855− "inset-inline-start" | "inset-inline-end" | "inset-block-start" | "inset-block-end" => {
2856− if let Some(v) = val {
2857− push_css(&mut css, effective_key, &css_px(v));
2858− }
2859− }
2860−
2861− // Logical border
2862− "border-inline"
2863− | "border-block"
2864− | "border-inline-start"
2865− | "border-inline-end"
2866− | "border-block-start"
2867− | "border-block-end" => {
2868− if let Some(v) = val {
2869− push_css(&mut css, effective_key, v);
2870− }
2871− }
2872−
2873− // Logical border-radius
2874− "border-start-start-radius"
2875− | "border-start-end-radius"
2876− | "border-end-start-radius"
2877− | "border-end-end-radius" => {
2878− if let Some(v) = val {
2879− push_css(&mut css, effective_key, &css_px(v));
2880− }
2881− }
2882−
2883− // Logical scroll margins & padding
2884− "scroll-margin-inline"
2885− | "scroll-margin-block"
2886− | "scroll-padding-inline"
2887− | "scroll-padding-block" => {
2888− if let Some(v) = val {
2889− push_css(&mut css, effective_key, &css_px_multi(v));
2890− }
2891− }
2892−
2893− // Logical sizing
2894− "inline-size" | "block-size" | "min-inline-size" | "max-inline-size"
2895− | "min-block-size" | "max-block-size" => {
2896− if let Some(v) = val {
2897− push_css(&mut css, effective_key, &css_px(v));
2898− }
2899− }
2900−
2901− // Scroll snap
2902− "scroll-snap-type" => {
2903− if let Some(v) = val {
2904− push_css(&mut css, "scroll-snap-type", v);
2905− }
2906− }
2907− "scroll-snap-align" => {
2908− if let Some(v) = val {
2909− push_css(&mut css, "scroll-snap-align", v);
2910− }
2911− }
2912−
2913− // Margin
2914− "margin" => {
2915− if let Some(v) = val {
2916− push_css(&mut css, "margin", &css_px_multi(v));
2917− }
2918− }
2919− "margin-x" => {
2920− if let Some(v) = val {
2921− push_css(&mut css, "margin-left", &css_px(v));
2922− push_css(&mut css, "margin-right", &css_px(v));
2923− }
2924− }
2925− "margin-y" => {
2926− if let Some(v) = val {
2927− push_css(&mut css, "margin-top", &css_px(v));
2928− push_css(&mut css, "margin-bottom", &css_px(v));
2929− }
2930− }
2931−
2932− // Filter
2933− "filter" => {
2934− if let Some(v) = val {
2935− push_css(&mut css, "filter", v);
2936− }
2937− }
2938−
2939− // Object fit/position (for images)
2940− "object-fit" => {
2941− if let Some(v) = val {
2942− push_css(&mut css, "object-fit", v);
2943− }
2944− }
2945− "object-position" => {
2946− if let Some(v) = val {
2947− push_css(&mut css, "object-position", v);
2948− }
2949− }
2950−
2951− // Text shadow
2952− "text-shadow" => {
2953− if let Some(v) = val {
2954− push_css(&mut css, "text-shadow", v);
2955− }
2956− }
2957−
2958− // Text overflow
2959− "text-overflow" => {
2960− if let Some(v) = val {
2961− push_css(&mut css, "text-overflow", v);
2962− }
2963− }
2964−
2965− // Interaction
2966− "pointer-events" => {
2967− if let Some(v) = val {
2968− push_css(&mut css, "pointer-events", v);
2969− }
2970− }
2971− "user-select" => {
2972− if let Some(v) = val {
2973− push_css(&mut css, "user-select", v);
2974− }
2975− }
2976−
2977− // Flexbox/grid alignment
2978− "justify-content" => {
2979− if let Some(v) = val {
2980− push_css(&mut css, "justify-content", v);
2981− }
2982− }
2983− "align-items" => {
2984− if let Some(v) = val {
2985− push_css(&mut css, "align-items", v);
2986− }
2987− }
2988−
2989− // Flex item order
2990− "order" => {
2991− if let Some(v) = val {
2992− push_css(&mut css, "order", v);
2993− }
2994− }
2995−
2996− // Background extras
2997− "background-size" => {
2998− if let Some(v) = val {
2999− push_css(&mut css, "background-size", v);
3000− }
3001− }
3002− "background-position" => {
3003− if let Some(v) = val {
3004− push_css(&mut css, "background-position", v);
3005− }
3006− }
3007− "background-repeat" => {
3008− if let Some(v) = val {
3009− push_css(&mut css, "background-repeat", v);
3010− }
3011− }
3012−
3013− // Text wrapping
3014− "word-break" => {
3015− if let Some(v) = val {
3016− push_css(&mut css, "word-break", v);
3017− }
3018− }
3019− "overflow-wrap" => {
3020− if let Some(v) = val {
3021− push_css(&mut css, "overflow-wrap", v);
3022− }
3023− }
3024−
3025− // Container queries
3026− "container" => {
3027− push_css(&mut css, "container-type", "inline-size");
3028− }
3029− "container-name" => {
3030− if let Some(v) = val {
3031− push_css(&mut css, "container-name", v);
3032− }
3033− }
3034− "container-type" => {
3035− if let Some(v) = val {
3036− push_css(&mut css, "container-type", v);
3037− }
3038− }
3039−
3040− // Overflow axis
3041− "overflow-x" => {
3042− if let Some(v) = val {
3043− push_css(&mut css, "overflow-x", v);
3044− }
3045− }
3046− "overflow-y" => {
3047− if let Some(v) = val {
3048− push_css(&mut css, "overflow-y", v);
3049− }
3050− }
3051−
3052− // Inset (shorthand for top/right/bottom/left)
3053− "inset" => {
3054− if let Some(v) = val {
3055− push_css(&mut css, "inset", &css_px(v));
3056− }
3057− }
3058−
3059− // Accent & caret colors
3060− "accent-color" => {
3061− if let Some(v) = val {
3062− push_css(&mut css, "accent-color", v);
3063− }
3064− }
3065− "caret-color" => {
3066− if let Some(v) = val {
3067− push_css(&mut css, "caret-color", v);
3068− }
3069− }
3070−
3071− // Color scheme & appearance
3072− "color-scheme" => {
3073− if let Some(v) = val {
3074− push_css(&mut css, "color-scheme", v);
3075− }
3076− }
3077− "appearance" => {
3078− if let Some(v) = val {
3079− push_css(&mut css, "appearance", v);
3080− }
3081− }
3082−
3083− // List style
3084− "list-style" => {
3085− if let Some(v) = val {
3086− push_css(&mut css, "list-style", v);
3087− }
3088− }
3089−
3090− // Table
3091− "border-collapse" => {
3092− if let Some(v) = val {
3093− push_css(&mut css, "border-collapse", v);
3094− }
3095− }
3096− "border-spacing" => {
3097− if let Some(v) = val {
3098− push_css(&mut css, "border-spacing", &css_px(v));
3099− }
3100− }
3101−
3102− // Text decoration
3103− "text-decoration" => {
3104− if let Some(v) = val {
3105− push_css(&mut css, "text-decoration", v);
3106− }
3107− }
3108− "text-decoration-color" => {
3109− if let Some(v) = val {
3110− push_css(&mut css, "text-decoration-color", v);
3111− }
3112− }
3113− "text-decoration-thickness" => {
3114− if let Some(v) = val {
3115− push_css(&mut css, "text-decoration-thickness", &css_px(v));
3116− }
3117− }
3118− "text-decoration-style" => {
3119− if let Some(v) = val {
3120− push_css(&mut css, "text-decoration-style", v);
3121− }
3122− }
3123− "text-underline-offset" => {
3124− if let Some(v) = val {
3125− push_css(&mut css, "text-underline-offset", &css_px(v));
3126− }
3127− }
3128−
3129− // Multi-column
3130− "column-width" => {
3131− if let Some(v) = val {
3132− push_css(&mut css, "column-width", &css_px(v));
3133− }
3134− }
3135− "column-rule" => {
3136− if let Some(v) = val {
3137− push_css(&mut css, "column-rule", v);
3138− }
3139− }
3140−
3141− // Place items/self
3142− "place-items" => {
3143− if let Some(v) = val {
3144− push_css(&mut css, "place-items", v);
3145− }
3146− }
3147− "place-self" => {
3148− if let Some(v) = val {
3149− push_css(&mut css, "place-self", v);
3150− }
3151− }
3152−
3153− // Scroll behavior
3154− "scroll-behavior" => {
3155− if let Some(v) = val {
3156− push_css(&mut css, "scroll-behavior", v);
3157− }
3158− }
3159−
3160− // Resize
3161− "resize" => {
3162− if let Some(v) = val {
3163− push_css(&mut css, "resize", v);
3164− }
3165− }
3166−
3167− // New CSS properties
3168− "clip-path" => {
3169− if let Some(v) = val {
3170− push_css(&mut css, "clip-path", v);
3171− }
3172− }
3173− "mix-blend-mode" => {
3174− if let Some(v) = val {
3175− push_css(&mut css, "mix-blend-mode", v);
3176− }
3177− }
3178− "background-blend-mode" => {
3179− if let Some(v) = val {
3180− push_css(&mut css, "background-blend-mode", v);
3181− }
3182− }
3183− "writing-mode" => {
3184− if let Some(v) = val {
3185− push_css(&mut css, "writing-mode", v);
3186− }
3187− }
3188− "column-count" => {
3189− if let Some(v) = val {
3190− push_css(&mut css, "column-count", v);
3191− }
3192− }
3193− "column-gap" => {
3194− if let Some(v) = val {
3195− push_css(&mut css, "column-gap", &css_px(v));
3196− }
3197− }
3198− "text-indent" => {
3199− if let Some(v) = val {
3200− push_css(&mut css, "text-indent", &css_px(v));
3201− }
3202− }
3203− "hyphens" => {
3204− if let Some(v) = val {
3205− push_css(&mut css, "hyphens", v);
3206− }
3207− }
3208− "flex-grow" => {
3209− if let Some(v) = val {
3210− push_css(&mut css, "flex-grow", v);
3211− }
3212− }
3213− "flex-shrink" => {
3214− if let Some(v) = val {
3215− push_css(&mut css, "flex-shrink", v);
3216− }
3217− }
3218− "flex-basis" => {
3219− if let Some(v) = val {
3220− push_css(&mut css, "flex-basis", &css_px(v));
3221− }
3222− }
3223− "isolation" => {
3224− if let Some(v) = val {
3225− push_css(&mut css, "isolation", v);
3226− }
3227− }
3228− "place-content" => {
3229− if let Some(v) = val {
3230− push_css(&mut css, "place-content", v);
3231− }
3232− }
3233− "background-image" => {
3234− if let Some(v) = val {
3235− push_css(&mut css, "background-image", v);
3236− }
3237− }
3238− "font-weight" => {
3239− if let Some(v) = val {
3240− push_css(&mut css, "font-weight", v);
3241− }
3242− }
3243− "font-style" => {
3244− if let Some(v) = val {
3245− push_css(&mut css, "font-style", v);
3246− }
3247− }
3248− "text-wrap" => {
3249− if let Some(v) = val {
3250− push_css(&mut css, "text-wrap", v);
3251− }
3252− }
3253− "will-change" => {
3254− if let Some(v) = val {
3255− push_css(&mut css, "will-change", v);
3256− }
3257− }
3258− "touch-action" => {
3259− if let Some(v) = val {
3260− push_css(&mut css, "touch-action", v);
3261− }
3262− }
3263− "vertical-align" => {
3264− if let Some(v) = val {
3265− push_css(&mut css, "vertical-align", v);
3266− }
3267− }
3268− "scroll-margin" => {
3269− if let Some(v) = val {
3270− push_css(&mut css, "scroll-margin", &css_px(v));
3271− }
3272− }
3273− "scroll-margin-top"
3274− | "scroll-margin-bottom"
3275− | "scroll-margin-left"
3276− | "scroll-margin-right" => {
3277− if let Some(v) = val {
3278− push_css(&mut css, effective_key, &css_px(v));
3279− }
3280− }
3281− "scroll-padding" => {
3282− if let Some(v) = val {
3283− push_css(&mut css, "scroll-padding", &css_px(v));
3284− }
3285− }
3286− "scroll-padding-top"
3287− | "scroll-padding-bottom"
3288− | "scroll-padding-left"
3289− | "scroll-padding-right" => {
3290− if let Some(v) = val {
3291− push_css(&mut css, effective_key, &css_px(v));
3292− }
3293− }
3294− "direction" => {
3295− if let Some(v) = val {
3296− push_css(&mut css, "direction", v);
3297− }
3298− }
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+ }
1737+}
32991738
3300− "content" => {
3301− if let Some(v) = val {
3302− // Wrap in quotes if not already quoted and not a CSS keyword
3303− if v.starts_with('"')
3304− || v.starts_with('\'')
3305− || v == "none"
3306− || v == "normal"
3307− || v.starts_with("attr(")
3308− || v.starts_with("counter(")
3309− {
3310− push_css(&mut css, "content", v);
3311− } else {
3312− push_css(&mut css, "content", &format!("\"{}\"", v));
3313− }
3314− }
3315− }
1739+// ---------------------------------------------------------------------------
1740+// Attribute → CSS mapping
1741+// ---------------------------------------------------------------------------
33161742
3317− // --- CSS Shorthands ---
3318− "truncate" => {
3319− push_css(&mut css, "overflow", "hidden");
3320− push_css(&mut css, "text-overflow", "ellipsis");
3321− push_css(&mut css, "white-space", "nowrap");
3322− }
3323− "line-clamp" => {
3324− if let Some(v) = val {
3325− push_css(&mut css, "display", "-webkit-box");
3326− push_css(&mut css, "-webkit-line-clamp", v);
3327− push_css(&mut css, "-webkit-box-orient", "vertical");
3328− push_css(&mut css, "overflow", "hidden");
3329− }
3330− }
3331− "blur" => {
3332− if let Some(v) = val {
3333− push_css(&mut css, "filter", &format!("blur({})", css_px(v)));
3334− }
3335− }
3336− "backdrop-blur" => {
3337− if let Some(v) = val {
3338− push_css(&mut css, "backdrop-filter", &format!("blur({})", css_px(v)));
3339− }
3340− }
3341− "no-scrollbar" => {
3342− push_css(&mut css, "scrollbar-width", "none");
3343− push_css(&mut css, "-ms-overflow-style", "none");
3344− }
3345− "skeleton" => {
3346− push_css(
3347− &mut css,
3348− "background",
3349− "linear-gradient(90deg,#e5e7eb 25%,#f3f4f6 50%,#e5e7eb 75%)",
3350− );
3351− push_css(&mut css, "background-size", "200% 100%");
3352− push_css(
3353− &mut css,
3354− "animation",
3355− "hl-skeleton 1.5s ease-in-out infinite",
3356− );
3357− }
3358− "gradient" => {
3359− if let Some(v) = val {
3360− // Parse: "from to [angle]" or "color1 color2 [angle]"
3361− let parts: Vec<&str> = v.split_whitespace().collect();
3362− let bg = if parts.len() >= 3
3363− && (parts[2].ends_with("deg")
3364− || parts[2].ends_with("turn")
3365− || parts[2].ends_with("rad"))
3366− {
3367− format!("linear-gradient({},{},{})", parts[2], parts[0], parts[1])
3368− } else if parts.len() >= 2 {
3369− format!("linear-gradient({},{})", parts[0], parts[1])
3370− } else {
3371− format!("linear-gradient({},transparent)", parts[0])
3372− };
3373− push_css(&mut css, "background", &bg);
3374− }
3375− }
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,
1755+}
33761756
3377− // Grid areas
3378− "grid-template-areas" => {
3379− if let Some(v) = val {
3380− push_css(&mut css, "grid-template-areas", v);
3381− }
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+ }
1768+ }
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+ })
1791+ }
1792+}
1793+
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+}
1813+
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;
33821826 }
3383− "grid-area" => {
3384− if let Some(v) = val {
3385− push_css(&mut css, "grid-area", v);
3386− }
1827+ let Some(axis) = attr.value.as_deref().and_then(Axis::of_value) else {
1828+ 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));
33871836 }
1837+ }
1838+ changes.sort_by_key(|(at, _)| at_order(at));
1839+ Flow {
1840+ base: Some(base),
1841+ changes,
1842+ class: None,
1843+ }
1844+ }
33881845
3389− // View transitions
3390− "view-transition-name" => {
3391− if let Some(v) = val {
3392− push_css(&mut css, "view-transition-name", v);
3393− }
3394− }
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))
1859+ }
1860+}
33951861
3396− // Animate shorthand (alias for animation)
3397− "animate" => {
3398− if let Some(v) = val {
3399− push_css(&mut css, "animation", v);
3400− }
3401− }
1862+/// `width` or `height`.
1863+#[derive(Clone, Copy, PartialEq, Eq)]
1864+enum Dim {
1865+ Width,
1866+ Height,
1867+}
34021868
3403− // CSS subgrid
3404− "grid-template-columns" => {
3405− if let Some(v) = val {
3406− push_css(&mut css, "grid-template-columns", v);
3407− }
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,
1876+}
1877+
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+ }
1885+ }
1886+}
1887+
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")],
1904+ }
1905+}
1906+
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+ ],
1921+ }
1922+}
1923+
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+}
1943+
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 {
1953+ 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+ _ => {}
34081979 }
3409− "grid-template-rows" => {
3410− if let Some(v) = val {
3411− push_css(&mut css, "grid-template-rows", v);
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+ }
34122023 }
2024+ return;
34132025 }
2026+ }
2027+ if !self.writes(property) {
2028+ push_css(css, property, value);
2029+ }
2030+ }
2031+}
2032+
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;
2048+ }
2049+ if let Some(size) = size {
2050+ sets.extend_from_slice(sizing(dim, size, Some(axis)));
2051+ }
2052+ resets.extend_from_slice(&sizing_properties(dim));
2053+ }
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;
2059+ }
2060+ written.push(property);
2061+ sizes.push(&mut css, property, value);
2062+ }
2063+ for &(property, value) in &sets {
2064+ sizes.push(&mut css, property, value);
2065+ }
2066+ css
2067+}
2068+
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()
2078+}
2079+
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);
2099+ }
2100+ }
2101+ Some(class)
2102+}
2103+
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+ }
2116+}
2117+
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;
2152+ }
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+ }
34142159
3415− // Scroll-driven animations
3416− "animation-timeline" => {
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" => {
34172172 if let Some(v) = val {
3418− push_css(&mut css, "animation-timeline", v);
2173+ push_css(&mut css, "gap", &with_px("gap", v));
34192174 }
34202175 }
3421− "animation-range" => {
3422− if let Some(v) = val {
3423− push_css(&mut css, "animation-range", v);
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;
34242188 }
3425− }
3426− "view-timeline-name" => {
3427− if let Some(v) = val {
3428− push_css(&mut css, "view-timeline-name", v);
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+ }) =>
2226+ {
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+ }
34292237 }
3430− }
3431− "view-timeline-axis" => {
34322238 if let Some(v) = val {
3433− push_css(&mut css, "view-timeline-axis", v);
2239+ push_css(&mut css, effective_key, &with_px(effective_key, v));
34342240 }
34352241 }
3436− "scroll-timeline-name" => {
3437− if let Some(v) = val {
3438− push_css(&mut css, "scroll-timeline-name", v);
3439− }
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");
34402249 }
3441− "scroll-timeline-axis" => {
3442− if let Some(v) = val {
3443− push_css(&mut css, "scroll-timeline-axis", v);
3444− }
2250+ "center-y" => {
2251+ push_css(&mut aligned, "margin-top", "auto");
2252+ push_css(&mut aligned, "margin-bottom", "auto");
34452253 }
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"),
34462258
3447− // Anchor positioning
3448− "anchor-name" => {
3449− if let Some(v) = val {
3450− push_css(&mut css, "anchor-name", v);
3451− }
3452− }
3453− "position-anchor" => {
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" => {
34542265 if let Some(v) = val {
3455− push_css(&mut css, "position-anchor", v);
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+ }
34562275 }
34572276 }
3458− "position-area" => {
2277+ "col-span" | "row-span" => {
34592278 if let Some(v) = val {
3460− push_css(&mut css, "position-area", v);
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));
34612285 }
34622286 }
3463− "inset-area" => {
3464− // Legacy alias for position-area
2287+
2288+ // CSS's `line-clamp` has no support yet without its
2289+ // `-webkit-` fallback, which needs a box to clamp
2290+ "line-clamp" => {
34652291 if let Some(v) = val {
3466− push_css(&mut css, "position-area", v);
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");
34672296 }
34682297 }
34692298
3470− // initial-letter (drop caps)
3471− "initial-letter" => {
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) => {
34722305 if let Some(v) = val {
3473− push_css(&mut css, "initial-letter", v);
2306+ push_css(&mut css, key, &with_px(key, v));
34742307 }
34752308 }
34762309
3477− // Critical CSS hint — not CSS, handled elsewhere
3478− "critical" => {}
3479−
3480− // Identity and HTML passthrough — not CSS
3481− "id" | "class" => {}
3482− "type" | "placeholder" | "name" | "value" | "disabled" | "required" | "checked"
3483− | "for" | "action" | "method" | "autocomplete" | "min" | "max" | "step" | "pattern"
3484− | "maxlength" | "rows" | "cols" | "multiple" | "alt" | "role" | "tabindex"
3485− | "title" | "controls" | "autoplay" | "loop" | "muted" | "poster" | "preload"
3486− | "loading" | "decoding" | "ordered" | "src" | "open" | "novalidate" | "low"
3487− | "high" | "optimum" | "colspan" | "rowspan" | "scope" | "inline" | "responsive"
3488− | "datetime" | "media" | "sizes" | "srcset" | "cite" | "list" | "sandbox" | "allow"
3489− | "allowfullscreen" | "referrerpolicy" | "formaction" | "formmethod" | "formtarget"
3490− | "target" | "autofocus" => {}
3491−
34922310 _ => {}
34932311 }
34942312 }
34952313
2314+ css.push_str(&aligned);
34962315 css
34972316}
34982317
@@ -3503,46 +2322,10 @@ fn push_css(css: &mut String, prop: &str, value: &str) {
35032322 css.push(';');
35042323}
35052324
3506−/// Known CSS units — if a value ends with one, skip appending `px`.
3507−const CSS_UNITS: &[&str] = &[
3508− "%", "rem", "em", "vh", "vw", "vmin", "vmax", "dvh", "svh", "lvh", "ch", "ex", "cm", "mm",
3509− "in", "pt", "pc", "fr",
3510−];
3511−
3512−/// Format a numeric value: if it already has a CSS unit, pass through as-is;
3513−/// otherwise append `px`.
3514−fn css_px(value: &str) -> String {
3515− let v = value.trim();
3516− if v == "0" {
3517− return "0".to_string();
3518− }
3519− if CSS_UNITS.iter().any(|u| v.ends_with(u)) {
3520− return v.to_string();
3521− }
3522− if v.starts_with("var(")
3523− || v.starts_with("calc(")
3524− || v.starts_with("clamp(")
3525− || v.starts_with("min(")
3526− || v.starts_with("max(")
3527− {
3528− return v.to_string();
3529− }
3530− format!("{}px", v)
3531−}
3532−
3533−/// Format multiple space-separated values, each getting px if needed.
3534−fn css_px_multi(value: &str) -> String {
3535− value
3536− .split_whitespace()
3537− .map(css_px)
3538− .collect::<Vec<_>>()
3539− .join(" ")
3540−}
3541−
35422325fn extract_id_class(attrs: &[Attribute]) -> (Option<String>, Option<String>) {
35432326 let mut id = None;
35442327 let mut class = None;
3545− for attr in attrs {
2328+ for attr in attrs.iter().filter(|a| a.html) {
35462329 match attr.key.as_str() {
35472330 "id" => id = attr.value.clone(),
35482331 "class" => class = attr.value.clone(),
@@ -3552,153 +2335,6 @@ fn extract_id_class(attrs: &[Attribute]) -> (Option<String>, Option<String>) {
35522335 (id, class)
35532336}
35542337
3555−/// Read image dimensions from a local file by parsing the header bytes.
3556−/// Supports PNG, JPEG, GIF, WebP, AVIF, and SVG.
3557−fn read_image_dimensions(path: &str) -> Option<(u32, u32)> {
3558− // SVG: parse as text for viewBox/width/height attributes
3559− if path.ends_with(".svg") || path.ends_with(".SVG") {
3560− let text = std::fs::read_to_string(path).ok()?;
3561− return read_svg_dimensions(&text);
3562− }
3563−
3564− let data = std::fs::read(path).ok()?;
3565− if data.len() < 12 {
3566− return None;
3567− }
3568−
3569− // PNG: 8-byte signature, then IHDR chunk with width/height at bytes 16-23
3570− if data.len() >= 24 && data.starts_with(b"\x89PNG\r\n\x1a\n") {
3571− let w = u32::from_be_bytes([data[16], data[17], data[18], data[19]]);
3572− let h = u32::from_be_bytes([data[20], data[21], data[22], data[23]]);
3573− return Some((w, h));
3574− }
3575−
3576− // GIF: "GIF87a" or "GIF89a", width/height at bytes 6-9 (little-endian)
3577− if data.starts_with(b"GIF87a") || data.starts_with(b"GIF89a") {
3578− let w = u16::from_le_bytes([data[6], data[7]]) as u32;
3579− let h = u16::from_le_bytes([data[8], data[9]]) as u32;
3580− return Some((w, h));
3581− }
3582−
3583− // JPEG: scan for SOF0/SOF2 marker (0xFF 0xC0 or 0xFF 0xC2)
3584− if data.starts_with(b"\xff\xd8") {
3585− let mut i = 2;
3586− while i + 9 < data.len() {
3587− if data[i] != 0xFF {
3588− i += 1;
3589− continue;
3590− }
3591− let marker = data[i + 1];
3592− if marker == 0xC0 || marker == 0xC2 {
3593− let h = u16::from_be_bytes([data[i + 5], data[i + 6]]) as u32;
3594− let w = u16::from_be_bytes([data[i + 7], data[i + 8]]) as u32;
3595− return Some((w, h));
3596− }
3597− if i + 3 < data.len() {
3598− let len = u16::from_be_bytes([data[i + 2], data[i + 3]]) as usize;
3599− i += 2 + len;
3600− } else {
3601− break;
3602− }
3603− }
3604− }
3605−
3606− // WebP: "RIFF" ... "WEBP", VP8 header at byte 20
3607− if data.len() >= 30 && &data[..4] == b"RIFF" && &data[8..12] == b"WEBP" {
3608− if &data[12..16] == b"VP8 " && data.len() >= 30 {
3609− let w = u16::from_le_bytes([data[26], data[27]]) as u32 & 0x3FFF;
3610− let h = u16::from_le_bytes([data[28], data[29]]) as u32 & 0x3FFF;
3611− return Some((w, h));
3612− }
3613− if &data[12..16] == b"VP8L" && data.len() >= 25 && data[21] == 0x2F {
3614− let bits = u32::from_le_bytes([data[22], data[23], data[24], data[25]]);
3615− let w = (bits & 0x3FFF) + 1;
3616− let h = ((bits >> 14) & 0x3FFF) + 1;
3617− return Some((w, h));
3618− }
3619− }
3620−
3621− // AVIF: ISOBMFF container with "ftyp" box containing "avif"/"avis" brand,
3622− // then "ispe" box with width/height
3623− if data.len() >= 12 && &data[4..8] == b"ftyp" {
3624− let brand = &data[8..12];
3625− if brand == b"avif" || brand == b"avis" || brand == b"mif1" {
3626− return read_avif_dimensions(&data);
3627− }
3628− }
3629−
3630− None
3631−}
3632−
3633−/// Parse SVG viewBox or width/height attributes to get dimensions.
3634−fn read_svg_dimensions(text: &str) -> Option<(u32, u32)> {
3635− // Try viewBox first: viewBox="minX minY width height"
3636− if let Some(vb_start) = text.find("viewBox=\"") {
3637− let rest = &text[vb_start + 9..];
3638− if let Some(end) = rest.find('"') {
3639− let parts: Vec<&str> = rest[..end].split_whitespace().collect();
3640− if parts.len() == 4
3641− && let (Ok(w), Ok(h)) = (parts[2].parse::<f64>(), parts[3].parse::<f64>())
3642− && w > 0.0
3643− && h > 0.0
3644− {
3645− return Some((w.round() as u32, h.round() as u32));
3646− }
3647− }
3648− }
3649− // Fall back to width/height attributes on <svg>
3650− let svg_tag = text.find("<svg")?;
3651− let tag_end = text[svg_tag..].find('>')? + svg_tag;
3652− let tag = &text[svg_tag..tag_end];
3653− let w = extract_svg_attr(tag, "width")?;
3654− let h = extract_svg_attr(tag, "height")?;
3655− Some((w, h))
3656−}
3657−
3658−fn extract_svg_attr(tag: &str, attr: &str) -> Option<u32> {
3659− let needle = format!("{}=\"", attr);
3660− let start = tag.find(&needle)? + needle.len();
3661− let rest = &tag[start..];
3662− let end = rest.find('"')?;
3663− let val = rest[..end].trim_end_matches("px");
3664− val.parse::<f64>().ok().map(|v| v.round() as u32)
3665−}
3666−
3667−/// Parse AVIF (ISOBMFF) container to find ispe box with image dimensions.
3668−fn read_avif_dimensions(data: &[u8]) -> Option<(u32, u32)> {
3669− // Walk ISOBMFF boxes looking for "ispe" (image spatial extents)
3670− let mut i = 0;
3671− while i + 8 <= data.len() {
3672− let box_size =
3673− u32::from_be_bytes([data[i], data[i + 1], data[i + 2], data[i + 3]]) as usize;
3674− let box_type = &data[i + 4..i + 8];
3675− if box_size < 8 {
3676− break;
3677− }
3678− let box_end = (i + box_size).min(data.len());
3679− // ispe box: 4 bytes version/flags + 4 bytes width + 4 bytes height
3680− if box_type == b"ispe" && box_end >= i + 20 {
3681− let w = u32::from_be_bytes([data[i + 12], data[i + 13], data[i + 14], data[i + 15]]);
3682− let h = u32::from_be_bytes([data[i + 16], data[i + 17], data[i + 18], data[i + 19]]);
3683− return Some((w, h));
3684− }
3685− // Recurse into container boxes (meta, iprp, ipco)
3686− if matches!(
3687− box_type,
3688− b"meta" | b"iprp" | b"ipco" | b"moov" | b"trak" | b"mdia"
3689− ) {
3690− let header_size = if box_type == b"meta" { 12 } else { 8 };
3691− if i + header_size < box_end
3692− && let Some(dims) = read_avif_dimensions(&data[i + header_size..box_end])
3693− {
3694− return Some(dims);
3695− }
3696− }
3697− i = box_end;
3698− }
3699− None
3700−}
3701−
37022338fn html_escape(s: &str) -> String {
37032339 s.replace('&', "&")
37042340 .replace('<', "<")
@@ -3737,10 +2373,24 @@ fn base64_encode(data: &[u8]) -> String {
37372373/// Generate a standard v3 source map with VLQ-encoded mappings.
37382374/// Compatible with browser devtools and source map tooling.
37392375pub 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 {
37402382 let mut mappings: Vec<(usize, usize)> = Vec::new(); // (html_line, hl_line)
3741− collect_source_lines(&doc.nodes, &mut mappings);
3742− mappings.sort_by_key(|m| m.0);
3743− 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+ }
37442394
37452395 // Build VLQ-encoded mappings string.
37462396 // Each generated line is separated by ';'. Each segment within a line is
@@ -3800,60 +2450,30 @@ fn vlq_encode(value: i64, out: &mut String) {
38002450 }
38012451}
38022452
3803−fn collect_source_lines(nodes: &[Node], mappings: &mut Vec<(usize, usize)>) {
3804− for node in nodes {
3805− if let Node::Element(elem) = node {
3806− if elem.line_num > 0 {
3807− mappings.push((mappings.len() + 1, elem.line_num));
3808− }
3809− collect_source_lines(&elem.children, mappings);
3810− }
3811− }
3812−}
3813−
3814−/// Check if a specific element kind exists anywhere in the node tree.
3815−fn has_element_kind(nodes: &[Node], target: &ElementKind) -> bool {
3816− for node in nodes {
3817− if let Node::Element(elem) = node {
3818− if elem.kind == *target {
3819− return true;
3820− }
3821− if has_element_kind(&elem.children, target) {
3822− return true;
3823− }
3824− }
3825− }
3826− false
3827−}
3828−
3829−/// Collect unique external domains from generated HTML for DNS prefetch hints.
3830−fn collect_dns_prefetch(html: &str, dev: bool) -> String {
3831− let mut domains = Vec::new();
3832− let mut rest = html;
3833− while let Some(pos) = rest.find("https://") {
3834− let start = pos + 8; // skip "https://"
3835− rest = &rest[start..];
3836− let end = rest
3837− .find(['/', '"', '\'', ' ', '>', ')'])
3838− .unwrap_or(rest.len());
3839− let domain = &rest[..end];
3840− if !domain.is_empty() && domain.contains('.') && !domains.contains(&domain.to_string()) {
3841− domains.push(domain.to_string());
3842− }
3843− }
3844− let mut out = String::new();
3845− for domain in &domains {
3846− if dev {
3847− out.push_str(&format!(
3848− "<link rel=\"dns-prefetch\" href=\"//{}\">\n",
3849− domain
3850− ));
3851− } else {
3852− out.push_str(&format!(
3853− "<link rel=\"dns-prefetch\" href=\"//{}\">",
3854− domain
3855− ));
3856− }
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()));
38572478 }
3858− out
38592479}