@@ -1,8 +1,7 @@
1use std::collections::HashMap;
1use std::collections::HashMap;
2−use std::hash::Hash;
2+use std::hash::{Hash, Hasher};
4use crate::ast::*;
4use crate::ast::*;
5−use crate::vocab::with_px;
7// ---------------------------------------------------------------------------
6// ---------------------------------------------------------------------------
8// Style collector: deduplicates CSS and assigns class names
7// Style collector: deduplicates CSS and assigns class names
@@ -17,315 +16,52 @@ const BREAKPOINTS: &[(&str, &str)] = &[
17 ("2xl", "1536px"),
16 ("2xl", "1536px"),
20−/// The prefix of every generated class (`hl-2k9xq0m`), which keeps them
19+/// Generate short CSS class names: a, b, ..., z, a0, a1, ..., z9, aa, ab, ...
21−/// out of the author's own class names.
20+pub(crate) fn short_class_name(idx: usize) -> String {
22−pub const CLASS_PREFIX: &str = "hl-";
21+ if idx < 26 {
23−
22+ return String::from((b'a' + idx as u8) as char);
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;
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);
40− hash = (hash ^ (hash >> 30)).wrapping_mul(0xbf58_476d_1ce4_e5b9);
41− hash = (hash ^ (hash >> 27)).wrapping_mul(0x94d0_49bb_1331_11eb);
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";
51− let digit = DIGITS[(n % 36) as usize] as char;
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)]
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)]
74− selector: Vec<String>,
78− /// The condition of an attribute's key, and the name after its
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()),
89− condition.at.sort_unstable();
90− condition.at.dedup();
94− /// Only the at-rule part: a direction under `hover:` is the one without
96− fn at_only(at: &[usize]) -> Condition {
99− selector: Vec::new(),
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)
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> {
113− .position(|p| crate::vocab::element_prefix(p).is_some())
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| {
124− .any(|&b| crate::vocab::at_rule_implied(a, b))
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))
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>);
142−fn at_order(at: &[usize]) -> AtOrder {
145− at.last().copied().unwrap_or(0),
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
159−type SelectorOrder = (bool, Vec<(usize, String)>, Vec<(usize, String)>);
161−fn selector_order(selector: &[String]) -> SelectorOrder {
162− let table = crate::vocab::PSEUDOS;
163− let ranked = |chain: &[String]| -> Vec<(usize, String)> {
167− let name = crate::vocab::pseudo_name(p);
170− .position(|(q, _)| *q == name)
171− .unwrap_or(table.len());
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])),
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) {
190− .position(|p| crate::vocab::element_prefix(p).is_some())
191− .unwrap_or(chain.len());
193− selector_order(&chain[..at]),
194− chain.get(at).cloned().unwrap_or_default(),
195− selector_order(chain.get(at + 1..).unwrap_or_default()),
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);
214− } else if let Some(pseudo) = crate::vocab::pseudo_selector(prefix) {
215− out.push_str(&pseudo);
218− out
24+ let mut n = idx - 26;
219−}
25+ let mut name = String::new();
220−
26+ // First char is always a letter
221−/// The rule for the elements an element prefix picks out inside the
27+ name.push((b'a' + (n % 26) as u8) as char);
222−/// element with the class `class` (see [`Condition::inside`]): the scope's
28+ n /= 26;
223−/// root, from the selector prefixes before it (`hover:@td:` is inside a
29+ loop {
224−/// hovered element), and the selector for the elements, from those after
30+ name.push((b'a' + (n % 36).min(25) as u8) as char);
225−/// it (`@td:hover:` is a hovered cell). `:scope td` leaves out the root
31+ if n < 36 {
226−/// itself, so `@ul [@ul:...]` styles the lists inside, not its own. `None`
32+ break;
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);
238− Some((root, target))
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()
246− .unwrap_or_default();
247− let name = prefix.trim_end_matches(':');
248− let width = |name: &str| {
251− .find(|(n, _)| *n == name)
252− .map_or("0", |(_, w)| *w)
254− let (kind, feature, value) = if let Some(size) = name.strip_prefix("cq-") {
255− ("@container", "min-width", width(size))
259− return "@media print".to_string();
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)),
269− format!("{} ({}: {})", kind, feature, value)
271− format!("{}({}:{})", kind, feature, value)
273−}
36+ // Reverse so it reads naturally
274−
37+ name.chars().rev().collect()
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
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}"));
286− for prefix in &condition.selector {
287− text.push_str(prefix);
291− text.push_str(body);
294− text.push_str(distinct);
298struct StyleEntry {
40struct StyleEntry {
299 class_name: String,
41 class_name: String,
300− /// The hash of the style, which names the class
42+ base: String,
301− style: u64,
43+ /// (CSS selector suffix, css_rules) — e.g. (":hover", "color:red;")
302− /// The defaults of the element's kind (its layout, a heading's
44+ pseudo: Vec<(String, String)>,
303− /// `margin:0`, ...), less what its own attributes set. They are written
45+ /// Responsive overrides: (breakpoint_prefix, css)
304− /// as `:where(.hl-a)` in the layer `hl-kind`, so an element prefix
46+ responsive: Vec<(String, String)>,
305− /// around it (`@h2:`), its parent's `children:` styles and its own
47+ /// Dark mode overrides
306− /// attributes, all in later layers, win over them.
48+ dark: String,
307− defaults: String,
49+ /// Print overrides
308− /// The element's rules: under each condition, its declarations, in the
50+ print: String,
309− /// order they are written
51+ motion_safe: String,
310− rules: Vec<(Condition, String)>,
52+ motion_reduce: String,
311− /// What else tells two elements with the same CSS apart: the rules
53+ landscape: String,
312− /// keyed on this class (see [`StyleCollector::keyed`]). Not written.
54+ portrait: String,
313− distinct: String,
55+ /// Container query overrides: (breakpoint_prefix, css)
56+ container: Vec<(String, String)>,
316struct StyleCollector {
59struct StyleCollector {
317 entries: Vec<StyleEntry>,
60 entries: Vec<StyleEntry>,
318− /// Maps a style's hash to its entries (more than one only when two
61+ /// Maps a pre-hashed style signature to an index into `entries`.
319− /// styles hash alike, which the full comparison tells apart).
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.
320 index: HashMap<u64, Vec<usize>>,
64 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)>,
331impl StyleCollector {
67impl StyleCollector {
@@ -333,282 +69,328 @@ impl StyleCollector {
333 StyleCollector {
69 StyleCollector {
334 entries: Vec::new(),
70 entries: Vec::new(),
335 index: HashMap::new(),
71 index: HashMap::new(),
336− names: std::collections::HashSet::new(),
338− keyed_seen: std::collections::HashSet::new(),
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);
350 /// Returns a class name for this style combination, or None if all empty.
75 /// Returns a class name for this style combination, or None if all empty.
76+ #[allow(clippy::too_many_arguments)]
351 fn get_class(
77 fn get_class(
352 &mut self,
78 &mut self,
353− defaults: String,
79+ base: String,
354− mut rules: Vec<(Condition, String)>,
80+ pseudo: Vec<(String, String)>,
355− distinct: String,
81+ responsive: Vec<(String, String)>,
85+ motion_reduce: String,
88+ container: Vec<(String, String)>,
356 ) -> Option<String> {
89 ) -> Option<String> {
357− rules.retain(|(_, body)| !body.is_empty());
90+ if base.is_empty()
358− if defaults.is_empty() && rules.is_empty() {
91+ && pseudo.is_empty()
92+ && responsive.is_empty()
95+ && motion_safe.is_empty()
96+ && motion_reduce.is_empty()
97+ && landscape.is_empty()
98+ && portrait.is_empty()
99+ && container.is_empty()
359 return None;
101 return None;
361− rules.sort_by_cached_key(|(condition, _)| condition.order());
103+ use std::collections::hash_map::DefaultHasher;
362− let style = stable_hash(&style_text(&defaults, &rules, &distinct));
104+ let mut h = DefaultHasher::new();
363−
105+ base.hash(&mut h);
364− if let Some(indices) = self.index.get(&style) {
106+ pseudo.hash(&mut h);
107+ responsive.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();
117+ if let Some(indices) = self.index.get(&sig) {
365 for &idx in indices {
118 for &idx in indices {
366 let e = &self.entries[idx];
119 let e = &self.entries[idx];
367− if e.defaults == defaults && e.rules == rules && e.distinct == distinct {
120+ if e.base == base
121+ && e.pseudo == pseudo
122+ && e.responsive == responsive
125+ && e.motion_safe == motion_safe
126+ && e.motion_reduce == motion_reduce
127+ && e.landscape == landscape
128+ && e.portrait == portrait
129+ && e.container == container
368 return Some(e.class_name.clone());
131 return Some(e.class_name.clone());
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
375 let idx = self.entries.len();
135 let idx = self.entries.len();
376− let name = (CLASS_DIGITS..=13)
136+ let name = short_class_name(idx);
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());
381 self.entries.push(StyleEntry {
137 self.entries.push(StyleEntry {
382 class_name: name.clone(),
138 class_name: name.clone(),
384− defaults,
140+ pseudo,
385− rules,
141+ responsive,
388− self.index.entry(style).or_default().push(idx);
150+ self.index.entry(sig).or_default().push(idx);
389 Some(name)
151 Some(name)
392− /// The classes given, in the order they were
154+ fn to_css_formatted(&self, dev: bool, use_layer: bool) -> String {
393− fn classes(&self) -> impl Iterator<Item = Class> + '_ {
155+ let mut css = String::new();
394− self.entries.iter().map(|e| Class {
156+ let inner_indent = if use_layer && dev { " " } else { "" };
395− name: e.class_name.clone(),
400− /// All generated rules, in three layers (see [`LAYERS`]): the element
158+ // Wrap in @layer for specificity management
401− /// kinds' defaults in `hl-kind` (`:where(.hl-a)`), the rules for the
159+ if use_layer {
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])),
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(","));
424− kind.push_str(&format!(" {} {{{}}}\n", selector, body));
161+ css.push_str("@layer htmlang {\n");
426− kind.push_str(&format!("{}{{{}}}", selector, body));
163+ css.push_str("@layer htmlang{");
430− let mut inside = self.blocks(true, dev);
167+ // Non-responsive rules. Base and pseudo rules are merged separately by
431− // A function's scoped `@style`, nested under its class
168+ // identical body so that e.g. `.a,.b{display:flex;flex-direction:column;}`
432− for block in scoped {
169+ // replaces two identical rules. Pseudo variants are grouped per selector
433− if dev {
170+ // suffix (`:hover` with `:hover`, etc.) to keep each pseudo's cascade
434− inside.push_str(block);
171+ // position independent of others.
435− inside.push('\n');
172+ let mut base_pairs: Vec<(&str, &str)> = Vec::with_capacity(self.entries.len());
436− } else {
173+ for e in &self.entries {
437− inside.push_str(&compact_css(block));
174+ if !e.base.is_empty() {
175+ base_pairs.push((e.class_name.as_str(), e.base.as_str()));
440−
178+ emit_grouped_rules(&mut css, &base_pairs, "", inner_indent, dev);
441− let mut css = String::new();
179+
442− for (name, rules) in [
180+ // Collect pseudo rules grouped by selector suffix, preserving the order
443− ("hl-kind", kind),
181+ // in which suffixes first appear across entries.
444− ("hl-inside", inside),
182+ let mut pseudo_order: Vec<&str> = Vec::new();
445− ("htmlang", self.blocks(false, dev)),
183+ let mut pseudo_buckets: HashMap<&str, Vec<(&str, &str)>> = HashMap::new();
446− ] {
184+ for e in &self.entries {
447− if rules.is_empty() {
185+ for (selector, body) in &e.pseudo {
448− continue;
186+ if body.is_empty() {
189+ let key = selector.as_str();
190+ if !pseudo_buckets.contains_key(key) {
191+ pseudo_order.push(key);
196+ .push((e.class_name.as_str(), body.as_str()));
451− css.push_str(&format!("@layer {} {{\n{}}}\n", name, rules));
199+ for selector in &pseudo_order {
452− } else {
200+ if let Some(pairs) = pseudo_buckets.get(selector) {
453− css.push_str(&format!("@layer {}{{{}}}", name, rules));
201+ emit_grouped_rules(&mut css, pairs, selector, inner_indent, dev);
459− /// The rules of every block of at-rules, in order: those for the
205+ // Responsive rules grouped by breakpoint
460− /// elements inside (`inside`: rules under an element prefix, each in
206+ for &(bp_name, bp_width) in BREAKPOINTS {
461− /// an `@scope` on its element's class), or the elements' own.
207+ let mut bp_pairs: Vec<(&str, &str)> = Vec::new();
462− fn blocks(&self, inside: bool, dev: bool) -> String {
208+ for e in &self.entries {
463− let mut css = String::new();
209+ for (bp, rule_css) in &e.responsive {
464− let rules = || {
210+ if bp == bp_name && !rule_css.is_empty() {
465− self.entries.iter().flat_map(move |e| {
211+ bp_pairs.push((e.class_name.as_str(), rule_css.as_str()));
468− .filter(move |(c, _)| c.inside().is_some() == inside)
469− .map(move |(c, body)| (e, c, body))
472− let mut blocks: Vec<&[usize]> = vec![&[]];
473− let keyed = self.keyed.iter().filter(|_| !inside);
475− .map(|(_, c, _)| c.at.as_slice())
476− .chain(keyed.map(|(at, _, _)| at.as_slice()));
478− if !blocks.contains(&at) {
482− blocks.sort_by_key(|at| at_order(at));
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))
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
498− let keyed: Vec<(&str, &str)> = self
501− .filter(|(a, _, _)| a.as_slice() == at)
502− .map(|(_, selector, body)| (selector.as_str(), body.as_str()))
504− emit_selector_rules(&mut inner, &keyed, &indent, dev);
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);
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
519− let mut scopes: Vec<(String, Vec<(String, &str)>)> = Vec::new();
520− for chain in chains {
521− let Some(element) = chain
523− .position(|p| crate::vocab::element_prefix(p).is_some())
528− rules().filter(|(_, c, _)| c.at == at && c.selector == chain)
530− let Some((root, target)) = scoped_selector(&e.class_name, chain, element)
534− match scopes.iter_mut().find(|(r, _)| *r == root) {
535− Some((_, targets)) => targets.push((target, body)),
536− None => scopes.push((root, vec![(target, body)])),
540− let inner_indent = if dev {
541− format!("{} ", indent)
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 { "}" });
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()))
562− emit_grouped_rules(&mut inner, &pairs, &indent, dev);
565− if inner.is_empty() {
215+ emit_media_block(
566− continue;
216+ &mut css,
217+ &format!("@media (min-width: {})", bp_width),
218+ &format!("@media(min-width:{})", bp_width),
226+ let dark_pairs: Vec<(&str, &str)> = self
229+ .filter(|e| !e.dark.is_empty())
230+ .map(|e| (e.class_name.as_str(), e.dark.as_str()))
234+ "@media (prefers-color-scheme: dark)",
235+ "@media(prefers-color-scheme:dark)",
242+ let print_pairs: Vec<(&str, &str)> = self
245+ .filter(|e| !e.print.is_empty())
246+ .map(|e| (e.class_name.as_str(), e.print.as_str()))
257+ // Motion safe rules
258+ let motion_safe_pairs: Vec<(&str, &str)> = self
261+ .filter(|e| !e.motion_safe.is_empty())
262+ .map(|e| (e.class_name.as_str(), e.motion_safe.as_str()))
266+ "@media (prefers-reduced-motion: no-preference)",
267+ "@media(prefers-reduced-motion:no-preference)",
273+ // Motion reduce rules
274+ let motion_reduce_pairs: Vec<(&str, &str)> = self
277+ .filter(|e| !e.motion_reduce.is_empty())
278+ .map(|e| (e.class_name.as_str(), e.motion_reduce.as_str()))
282+ "@media (prefers-reduced-motion: reduce)",
283+ "@media(prefers-reduced-motion:reduce)",
284+ &motion_reduce_pairs,
290+ let landscape_pairs: Vec<(&str, &str)> = self
293+ .filter(|e| !e.landscape.is_empty())
294+ .map(|e| (e.class_name.as_str(), e.landscape.as_str()))
298+ "@media (orientation: landscape)",
299+ "@media(orientation:landscape)",
306+ let portrait_pairs: Vec<(&str, &str)> = self
309+ .filter(|e| !e.portrait.is_empty())
310+ .map(|e| (e.class_name.as_str(), e.portrait.as_str()))
314+ "@media (orientation: portrait)",
315+ "@media(orientation:portrait)",
321+ // Container query rules grouped by breakpoint
322+ for &(bp_name, bp_width) in BREAKPOINTS {
323+ let mut cq_pairs: Vec<(&str, &str)> = Vec::new();
324+ for e in &self.entries {
325+ for (bp, rule_css) in &e.container {
326+ if bp == bp_name && !rule_css.is_empty() {
327+ cq_pairs.push((e.class_name.as_str(), rule_css.as_str()));
568− // Each at-rule wraps the next, outermost first
331+ emit_media_block(
569− for (level, &rank) in at.iter().enumerate().rev() {
332+ &mut css,
570− let pad = if dev {
333+ &format!("@container (min-width: {})", bp_width),
571− " ".repeat(level)
334+ &format!("@container(min-width:{})", bp_width),
572− } else {
335+ &cq_pairs,
573− String::new()
336+ "",
575− inner = if dev {
338+ );
576− format!("{pad}{} {{\n{inner}{pad}}}\n", at_rule(rank, true))
339+ }
578− format!("{}{{{inner}}}", at_rule(rank, false))
341+ // Close @layer
579− };
342+ if use_layer {
344+ css.push_str("}\n");
581− css.push_str(&inner);
587−/// Emit CSS rules from `(selector, body)` pairs, merging identical bodies
354+/// Emit CSS rules from `(class_name, body)` pairs, merging identical bodies
588/// into a single selector-list rule (e.g. `.a,.b{body}`). The first occurrence
355/// 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
356/// of each distinct body determines ordering, so output stays deterministic
590−/// across runs. `indent` is prepended to each rule line.
357+/// across runs. `selector_suffix` is appended to each class (e.g. `":hover"`,
591−fn emit_grouped_rules(out: &mut String, pairs: &[(String, &str)], indent: &str, dev: bool) {
358+/// or `""` for plain class rules). `indent` is prepended to each rule line.
359+fn emit_grouped_rules(
361+ pairs: &[(&str, &str)],
362+ selector_suffix: &str,
592 if pairs.is_empty() {
366 if pairs.is_empty() {
595 // Group in first-occurrence order.
369 // Group in first-occurrence order.
596 let mut order: Vec<&str> = Vec::new();
370 let mut order: Vec<&str> = Vec::new();
597 let mut groups: HashMap<&str, Vec<&str>> = HashMap::new();
371 let mut groups: HashMap<&str, Vec<&str>> = HashMap::new();
598− for (selector, body) in pairs {
372+ for &(name, body) in pairs {
599 if body.is_empty() {
373 if body.is_empty() {
600 continue;
374 continue;
602 if !groups.contains_key(body) {
376 if !groups.contains_key(body) {
603 order.push(body);
377 order.push(body);
605− groups.entry(body).or_default().push(selector);
379+ groups.entry(body).or_default().push(name);
607 let sp = if dev { " " } else { "" };
381 let sp = if dev { " " } else { "" };
608 let nl = if dev { "\n" } else { "" };
382 let nl = if dev { "\n" } else { "" };
609 for body in &order {
383 for body in &order {
384+ let names = &groups[body];
610 out.push_str(indent);
385 out.push_str(indent);
611− out.push_str(&groups[body].join(","));
386+ for (i, n) in names.iter().enumerate() {
392+ out.push_str(selector_suffix);
612 out.push_str(sp);
394 out.push_str(sp);
613 out.push('{');
395 out.push('{');
614 out.push_str(body);
396 out.push_str(body);
@@ -617,44 +399,38 @@ fn emit_grouped_rules(out: &mut String, pairs: &[(String, &str)], indent: &str,
620−/// Emit `(selector, body)` rules in their order, merging a run of rules
402+/// Emit an `@media` / `@container` block containing grouped class rules.
621−/// with the same body into one rule with a selector list (the order
403+/// Skips the block entirely if no non-empty bodies are present.
622−/// matters: two rules may apply to one element).
404+fn emit_media_block(
623−fn emit_selector_rules(out: &mut String, rules: &[(&str, &str)], indent: &str, dev: bool) {
405+ out: &mut String,
624− let mut i = 0;
406+ header_dev: &str,
625− while i < rules.len() {
407+ header_min: &str,
626− let body = rules[i].1;
408+ pairs: &[(&str, &str)],
627− let run = rules[i..].iter().take_while(|(_, b)| *b == body).count();
409+ selector_suffix: &str,
628− if !body.is_empty() {
410+ dev: bool,
629− let selectors: Vec<&str> = rules[i..i + run].iter().map(|(s, _)| *s).collect();
411+) {
630− out.push_str(indent);
412+ if pairs.iter().all(|(_, body)| body.is_empty()) {
631− out.push_str(&selectors.join(","));
413+ return;
633− out.push(' ');
415+ let mut inner = String::new();
634− }
416+ let inner_indent = if dev { " " } else { "" };
635− out.push('{');
417+ emit_grouped_rules(&mut inner, pairs, selector_suffix, inner_indent, dev);
636− out.push_str(body);
418+ if inner.is_empty() {
637− out.push('}');
419+ return;
639− out.push('\n');
421+ if dev {
640− }
422+ out.push_str(&format!("{} {{\n{}}}\n", header_dev, inner));
642− i += run;
424+ out.push_str(&format!("{}{{{}}}", header_min, inner));
646struct GenContext {
428struct GenContext {
647 dev: bool,
429 dev: bool,
648 depth: usize,
430 depth: usize,
649 has_interactive: bool,
432 has_interactive: bool,
650− /// Writing inside a text element, at any depth: htmlang's own `<div>`s
433+ has_defer: bool,
651− /// are `<span>`s there, which text can hold.
653− /// How the element whose children are being written lays them out
655− /// Writing the children of a `@picture`, where `@source`'s leading
656− /// argument is its `srcset`
660impl GenContext {
436impl GenContext {
@@ -680,26 +456,23 @@ pub struct CodegenOptions {
680 pub dev: bool,
456 pub dev: bool,
681 pub partial: bool,
457 pub partial: bool,
682 pub minify: bool,
458 pub minify: bool,
685/// Generate HTML from a parsed document using the given options.
462/// Generate HTML from a parsed document using the given options.
686pub fn generate_with(doc: &Document, opts: &CodegenOptions) -> String {
463pub fn generate_with(doc: &Document, opts: &CodegenOptions) -> String {
687− generate_with_classes(doc, opts).0
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();
694 let mut html = if opts.partial {
464 let mut html = if opts.partial {
695− generate_partial_inner(doc, opts.dev, &mut classes)
465+ generate_partial_inner(doc, opts.dev)
697− generate_full_inner(doc, opts.dev, &mut classes)
467+ generate_full_inner(doc, opts.dev)
699 if opts.minify {
469 if opts.minify {
700 html = minify_html(&html);
470 html = minify_html(&html);
702− (html, classes)
472+ if opts.compat {
473+ html = add_vendor_prefixes(&html);
705pub fn generate(doc: &Document) -> String {
478pub fn generate(doc: &Document) -> String {
@@ -747,6 +520,38 @@ pub fn generate_minified(doc: &Document) -> String {
523+pub fn generate_compat(doc: &Document) -> String {
528+ ..Default::default()
533+pub fn generate_dev_compat(doc: &Document) -> String {
539+ ..Default::default()
544+pub fn generate_minified_compat(doc: &Document) -> String {
550+ ..Default::default()
750fn minify_html(html: &str) -> String {
555fn minify_html(html: &str) -> String {
751 let mut result = String::with_capacity(html.len());
556 let mut result = String::with_capacity(html.len());
752 let mut in_pre = false;
557 let mut in_pre = false;
@@ -761,9 +566,9 @@ fn minify_html(html: &str) -> String {
761 if i + 4 < chars.len() && chars[i] == '<' {
566 if i + 4 < chars.len() && chars[i] == '<' {
762 let rest: String = chars[i..].iter().take(10).collect();
567 let rest: String = chars[i..].iter().take(10).collect();
763 let rest_lower = rest.to_lowercase();
568 let rest_lower = rest.to_lowercase();
764− if rest_lower.starts_with("<pre") || rest_lower.starts_with("<textarea") {
569+ if rest_lower.starts_with("<pre") {
765 in_pre = true;
570 in_pre = true;
766− } else if rest_lower.starts_with("</pre") || rest_lower.starts_with("</textarea") {
571+ } else if rest_lower.starts_with("</pre") {
767 in_pre = false;
572 in_pre = false;
768 } else if rest_lower.starts_with("<script") {
573 } else if rest_lower.starts_with("<script") {
769 in_script = true;
574 in_script = true;
@@ -805,11 +610,10 @@ fn minify_html(html: &str) -> String {
805 continue;
610 continue;
808− // Collapse whitespace runs to a single space. Spaces are never
613+ // Collapse whitespace between tags
809− // dropped entirely: next to inline elements they are significant
810− // ("Built with <span>" must keep its space).
811 if chars[i].is_whitespace() {
614 if chars[i].is_whitespace() {
812 if !prev_was_space {
615 if !prev_was_space {
616+ // Only emit a space if we're between content (not between tags)
813 result.push(' ');
617 result.push(' ');
814 prev_was_space = true;
618 prev_was_space = true;
@@ -817,6 +621,14 @@ fn minify_html(html: &str) -> String {
817 continue;
621 continue;
624+ // Trim space before closing tags
625+ if chars[i] == '<' && prev_was_space {
626+ // Remove trailing space before tag
627+ if result.ends_with(' ') {
820 prev_was_space = false;
632 prev_was_space = false;
821 result.push(chars[i]);
633 result.push(chars[i]);
@@ -825,152 +637,177 @@ fn minify_html(html: &str) -> String {
828−fn generate_full_inner(doc: &Document, dev: bool, classes: &mut Vec<Class>) -> String {
640+/// Add vendor prefixes to CSS within <style> tags for broader browser compatibility.
829− // Without `@page` the output is a fragment
641+fn add_vendor_prefixes(html: &str) -> String {
830− let Some(page) = &doc.page else {
642+ // Find CSS within <style>...</style> and add vendor prefixes
831− return generate_partial_inner(doc, dev, classes);
643+ let mut result = String::with_capacity(html.len() + 512);
832− };
644+ let mut rest = html;
645+ while let Some(start) = rest.find("<style>") {
646+ let after_tag = start + 7;
647+ result.push_str(&rest[..after_tag]);
648+ rest = &rest[after_tag..];
649+ if let Some(end) = rest.find("</style>") {
650+ let css = &rest[..end];
651+ result.push_str(&prefix_css(css));
652+ result.push_str("</style>");
653+ rest = &rest[end + 8..];
658+ result.push_str(rest);
662+fn prefix_css(css: &str) -> String {
663+ let mut out = String::with_capacity(css.len() + 256);
665+ let bytes = css.as_bytes();
666+ while i < bytes.len() {
667+ // Find property declarations
668+ if let Some(pos) = css[i..].find('{') {
669+ let brace = i + pos;
670+ out.push_str(&css[i..=brace]);
672+ // Process declarations within this block
673+ if let Some(close) = css[i..].find('}') {
674+ let block = &css[i..i + close];
675+ out.push_str(&prefix_declarations(block));
680+ out.push_str(&css[i..]);
687+fn prefix_declarations(block: &str) -> String {
688+ let mut out = String::with_capacity(block.len() + 128);
689+ for decl in block.split(';') {
690+ let decl = decl.trim();
691+ if decl.is_empty() {
694+ if let Some((prop, val)) = decl.split_once(':') {
695+ let prop = prop.trim();
696+ let val = val.trim();
698+ "backdrop-filter" => {
699+ out.push_str(&format!("-webkit-backdrop-filter:{};", val));
700+ out.push_str(&format!("backdrop-filter:{};", val));
703+ out.push_str(&format!("-webkit-user-select:{};", val));
704+ out.push_str(&format!("-moz-user-select:{};", val));
705+ out.push_str(&format!("user-select:{};", val));
708+ out.push_str(&format!("-webkit-appearance:{};", val));
709+ out.push_str(&format!("-moz-appearance:{};", val));
710+ out.push_str(&format!("appearance:{};", val));
712+ "background-clip" if val.contains("text") => {
713+ out.push_str(&format!("-webkit-background-clip:{};", val));
714+ out.push_str(&format!("background-clip:{};", val));
717+ out.push_str(&format!("-webkit-hyphens:{};", val));
718+ out.push_str(&format!("-ms-hyphens:{};", val));
719+ out.push_str(&format!("hyphens:{};", val));
721+ "text-size-adjust" => {
722+ out.push_str(&format!("-webkit-text-size-adjust:{};", val));
723+ out.push_str(&format!("-ms-text-size-adjust:{};", val));
724+ out.push_str(&format!("text-size-adjust:{};", val));
726+ "mask-image" | "mask-size" | "mask-repeat" | "mask-position" => {
727+ out.push_str(&format!("-webkit-{}:{};", prop, val));
728+ out.push_str(&format!("{}:{};", prop, val));
743+fn generate_full_inner(doc: &Document, dev: bool) -> String {
833 let mut styles = StyleCollector::new();
744 let mut styles = StyleCollector::new();
834 let mut ctx = GenContext {
745 let mut ctx = GenContext {
836 depth: 0,
747 depth: 0,
837 has_interactive: false,
749 has_interactive: false,
838− in_text: false,
750+ has_defer: false,
839− flow: Flow::default(),
843− // The page is the root element: `<body>` is a column (the reset makes
753+ // Check if document has @main for skip-to-content link
844− // it one, filling the viewport), `@page`'s styles are its class, and
754+ let has_main = has_element_kind(&doc.nodes, &ElementKind::Main);
845− // the page's top-level elements are its children
846− let root = Element {
847− kind: ElementKind::El,
848− attrs: page.styles.clone(),
850− children: Vec::new(),
854− let mut own = Flow::of(&root);
855− let top = Flow::default();
859− has_overlay_children: holds_overlays(&doc.nodes),
863− let body_class = element_class(&root, &site, &mut styles);
864− own.class = body_class.clone();
867 let mut body = String::new();
756 let mut body = String::new();
870− Some(Layout::Column),
876− let element_css = build_element_css(doc, &styles, dev);
877− let nl = if dev { "\n" } else { "" };
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\">{}",
887− meta_html.push_str(&format!(
888− "<title>{}</title>{}",
889− html_escape(&page.title),
892− for (name, content) in &doc.meta_tags {
893− meta_html.push_str(&format!(
894− "<meta name=\"{}\" content=\"{}\">{}",
896− html_escape(content),
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),
908− if let Some(path) = &page.favicon {
909− meta_html.push_str(&format!(
910− "<link rel=\"icon\" href=\"{}\">{}",
915− for block in &doc.head_blocks {
916− meta_html.push_str(block);
917− meta_html.push_str(nl);
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);
925− let mut body_attrs = String::new();
926− emit_class_attr(&mut body_attrs, body_class.as_deref(), None);
928− // Focus-visible CSS for interactive elements (accessibility)
758+ // Skip-to-content link for accessibility (only when @main exists)
929− let focus_visible_css = if ctx.has_interactive {
759+ if has_main {
930− let focusable = ":where(a,button,input,select,textarea):focus-visible";
932− format!(
761+ body.push_str("<a href=\"#hl-main\" class=\"hl-skip\">Skip to content</a>\n");
933− "{}{} {{ outline: 2px solid currentColor; outline-offset: 2px; }}\n",
934− OWN_ELEMENTS, focusable
937− format!(
763+ body.push_str("<a href=\"#hl-main\" class=\"hl-skip\">Skip to content</a>");
938− "{}{}{{outline:2px solid currentColor;outline-offset:2px}}",
939− OWN_ELEMENTS, focusable
945− let reset_css = reset_css(dev, true, &focus_visible_css);
946− classes.extend(styles.classes());
948− format!(
767+ for node in &doc.nodes {
949− "<!DOCTYPE html>{nl}<html{root_attrs}>{nl}<head>{nl}<meta charset=\"utf-8\">{nl}\
768+ generate_node(node, None, &mut body, &mut styles, &mut ctx);
950− {meta_html}<style>{nl}{reset_css}{element_css}</style>{nl}</head>{nl}\
769+ }
951− <body{body_attrs}>{nl}{body}</body>{nl}</html>{nl}",
770+
952− )
771+ // Collect external domains for DNS prefetch
953−}
772+ let dns_prefetch_html = collect_dns_prefetch(&body, dev);
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 {
959 let mut element_css = String::new();
774 let mut element_css = String::new();
961− // Collect the CSS custom properties declared with `@let --name` so they
776+ // Collect all CSS custom properties (explicit `@let --name` / `@theme`
962− // can be emitted in a single `:root` block below.
777+ // tokens, plus any auto-extracted repeats) so they can be emitted in a
778+ // single `:root` block below.
963 let mut root_vars: Vec<(String, String)> = Vec::new();
779 let mut root_vars: Vec<(String, String)> = Vec::new();
964 for (name, value) in &doc.css_vars {
780 for (name, value) in &doc.css_vars {
965 root_vars.push((name.clone(), value.clone()));
781 root_vars.push((name.clone(), value.clone()));
783+ for (name, value) in &doc.theme_tokens {
784+ let css_name = format!("--{}", name);
785+ if !root_vars.iter().any(|(n, _)| *n == css_name) {
786+ root_vars.push((css_name, value.clone()));
968− // Generated rules always go in htmlang's layers, so unlayered user CSS
790+ let has_custom_css = !doc.custom_css.is_empty();
969− // (`@style`, `@raw`) overrides them regardless of specificity.
791+ let styles_css = styles.to_css_formatted(dev, !has_custom_css);
970− let styles_css = styles.to_css_formatted(dev, &doc.scoped_css);
792+ // Fold literal values declared via `@theme` / `@let --name` back into
793+ // `var(--name)` references so the generated CSS actually uses the
794+ // custom properties emitted in `:root`. Saves bytes and makes runtime
795+ // theming take effect.
796+ let styles_css = substitute_css_vars(&styles_css, &root_vars);
797+ // Further compress the CSS by auto-extracting any remaining literal
798+ // values that appear often enough for `var(--hN)` references to come out
799+ // shorter overall. Disabled in dev mode to keep the generated CSS
801+ let styles_css = if dev {
804+ let (new_css, auto_vars) = auto_extract_repeats(&styles_css, &root_vars);
805+ root_vars.extend(auto_vars);
972− // Emit the :root block first so the cascade picks up the custom
809+ // Emit the (possibly extended) :root block first so the cascade picks up
973− // properties before the class rules consume them.
810+ // the custom properties before the class rules consume them.
974 if !root_vars.is_empty() {
811 if !root_vars.is_empty() {
976 element_css.push_str(":root {\n");
813 element_css.push_str(":root {\n");
@@ -992,121 +829,537 @@ fn build_element_css(doc: &Document, styles: &StyleCollector, dev: bool) -> Stri
993 element_css.push_str(&styles_css);
830 element_css.push_str(&styles_css);
833+ for (name, kf_body) in &doc.keyframes {
835+ element_css.push_str(&format!("@keyframes {} {{\n{}\n}}\n", name, kf_body));
837+ element_css.push_str(&format!("@keyframes {}{{{}}}", name, kf_body));
841+ // Auto-inject skeleton keyframe if skeleton attribute is used
842+ let skeleton_used = element_css.contains("hl-skeleton");
845+ element_css.push_str("@keyframes hl-skeleton {\n 0% { background-position: 200% 0; }\n 100% { background-position: -200% 0; }\n}\n");
847+ element_css.push_str("@keyframes hl-skeleton{0%{background-position:200% 0}100%{background-position:-200% 0}}");
851+ // Also inject carousel webkit scrollbar hiding
852+ let carousel_used = element_css.contains("scroll-snap-type:x mandatory");
853+ if carousel_used && !element_css.contains("::-webkit-scrollbar") {
854+ // The carousel class already has scrollbar-width:none, but webkit needs pseudo-element
855+ // We add a global rule for carousel-style elements
995 // @style blocks (custom CSS)
858 // @style blocks (custom CSS)
996 for block in &doc.custom_css {
859 for block in &doc.custom_css {
998 element_css.push_str(block);
861 element_css.push_str(block);
999 element_css.push('\n');
862 element_css.push('\n');
1000 } else {
863 } else {
1001− element_css.push_str(&compact_css(block));
864+ // Minify: collapse whitespace
865+ let minified: String = block.lines().map(|l| l.trim()).collect::<Vec<_>>().join("");
866+ element_css.push_str(&minified);
1005− element_css
870+ // @scope blocks
1006−}
871+ for block in &doc.scope_blocks {
1008−/// An `@style` body on one line: each line trimmed, and the lines joined with
873+ element_css.push_str(block);
1009−/// a space, so a value that goes on over two lines (`margin: 0` then `auto;`)
874+ element_css.push('\n');
1010−/// keeps its words apart.
1011−fn compact_css(block: &str) -> String {
1015− .filter(|l| !l.is_empty())
1016− .collect::<Vec<_>>()
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-\"])";
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"];
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();
1048− rules.push(if dev {
1049− "*, *::before, *::after { box-sizing: border-box; }".to_string()
1051− "*,*::before,*::after{box-sizing:border-box}".to_string()
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()
1055 } else {
875 } else {
1056− "body{margin:0;font-family:system-ui,-apple-system,sans-serif;display:flex;flex-direction:column;min-height:100dvh}".to_string()
876+ let minified: String = block.lines().map(|l| l.trim()).collect::<Vec<_>>().join("");
1057− });
877+ element_css.push_str(&minified);
1059− rules.push(if dev {
879+ }
1060− format!("{own}, {own}::before, {own}::after {{ box-sizing: border-box; }}")
880+
881+ // @starting-style blocks
882+ if !doc.starting_style_blocks.is_empty() {
884+ element_css.push_str("@starting-style {\n");
885+ for block in &doc.starting_style_blocks {
886+ element_css.push_str(block);
887+ element_css.push('\n');
889+ element_css.push_str("}\n");
1061 } else {
890 } else {
1062− format!("{own},{own}::before,{own}::after{{box-sizing:border-box}}")
891+ element_css.push_str("@starting-style{");
1063− });
892+ for block in &doc.starting_style_blocks {
893+ let minified: String = block.lines().map(|l| l.trim()).collect::<Vec<_>>().join("");
894+ element_css.push_str(&minified);
896+ element_css.push('}');
1065− let hidden = "[hidden]:not([hidden=\"until-found\"]),dialog:not([open]):not(:popover-open),\
899+
1066− [popover]:not(:popover-open):not(dialog[open])";
900+ // Build meta tags string
1067− rules.push(if dev {
901+ let meta_html = if doc.meta_tags.is_empty() {
1068− format!("{own}:where({hidden}) {{ display: none !important; }}")
902+ String::new()
1069 } else {
903 } else {
1070− format!("{own}:where({hidden}){{display:none!important}}")
904+ let mut m = String::new();
1071− });
905+ for (name, content) in &doc.meta_tags {
1072− let mut rules = rules.join(if dev { "\n" } else { "" });
906+ if dev {
1073− if dev {
907+ m.push_str(&format!(
1074− rules.push('\n');
908+ "<meta name=\"{}\" content=\"{}\">\n",
910+ html_escape(content)
913+ m.push_str(&format!(
914+ "<meta name=\"{}\" content=\"{}\">",
916+ html_escape(content)
923+ // Build OG meta tags
924+ let og_html = if doc.og_tags.is_empty() {
927+ let mut o = String::new();
928+ for (property, content) in &doc.og_tags {
930+ o.push_str(&format!(
931+ "<meta property=\"og:{}\" content=\"{}\">\n",
932+ html_escape(property),
933+ html_escape(content)
936+ o.push_str(&format!(
937+ "<meta property=\"og:{}\" content=\"{}\">",
938+ html_escape(property),
939+ html_escape(content)
946+ // Build head blocks string
947+ let head_html = if doc.head_blocks.is_empty() {
950+ let mut h = String::new();
951+ for block in &doc.head_blocks {
960+ let lang_attr = match &doc.lang {
961+ Some(lang) => format!(" lang=\"{}\"", html_escape(lang)),
962+ None => String::new(),
965+ let favicon_html = match &doc.favicon {
967+ // Try to read and inline the favicon
968+ if let Ok(data) = std::fs::read(path) {
969+ let mime = if path.ends_with(".ico") {
971+ } else if path.ends_with(".png") {
973+ } else if path.ends_with(".svg") {
978+ let b64 = base64_encode(&data);
981+ "<link rel=\"icon\" href=\"data:{};base64,{}\">\n",
985+ format!("<link rel=\"icon\" href=\"data:{};base64,{}\">", mime, b64)
988+ // Fall back to href
990+ format!("<link rel=\"icon\" href=\"{}\">\n", html_escape(path))
992+ format!("<link rel=\"icon\" href=\"{}\">", html_escape(path))
996+ None => String::new(),
1000+ let canonical_html = match &doc.canonical {
1003+ format!("<link rel=\"canonical\" href=\"{}\">\n", html_escape(url))
1005+ format!("<link rel=\"canonical\" href=\"{}\">", html_escape(url))
1008+ None => String::new(),
1012+ let base_html = match &doc.base_url {
1015+ format!("<base href=\"{}\">\n", html_escape(url))
1017+ format!("<base href=\"{}\">", html_escape(url))
1020+ None => String::new(),
1024+ for (name, url) in &doc.font_faces {
1025+ let format_hint = if url.ends_with(".woff2") {
1027+ } else if url.ends_with(".woff") {
1029+ } else if url.ends_with(".ttf") {
1030+ " format('truetype')"
1031+ } else if url.ends_with(".otf") {
1032+ " format('opentype')"
1037+ element_css.insert_str(0, &format!(
1038+ "@font-face {{\n font-family: '{}';\n src: url('{}'){};\n font-display: swap;\n}}\n",
1039+ name, url, format_hint
1042+ element_css.insert_str(
1045+ "@font-face{{font-family:'{}';src:url('{}'){};font-display:swap}}",
1046+ name, url, format_hint
1076− rules.push_str(focus_visible_css);
1051+
1077− if dev {
1052+ // JSON-LD blocks
1078− format!(
1053+ let json_ld_html: String = doc
1079− "@layer {};\n@layer hl-reset {{\n{}}}\n",
1054+ .json_ld_blocks
1080− LAYERS.join(", "),
1055+ .iter()
1081− rules
1056+ .map(|block| {
1059+ "<script type=\"application/ld+json\">\n{}\n</script>\n",
1063+ format!("<script type=\"application/ld+json\">{}</script>", block)
1069+ let manifest_html = if let Some(ref manifest) = doc.manifest {
1070+ let mut json = String::from("{");
1071+ json.push_str(&format!("\"name\":\"{}\",", manifest.name));
1072+ if let Some(ref short) = manifest.short_name {
1073+ json.push_str(&format!("\"short_name\":\"{}\",", short));
1075+ json.push_str(&format!("\"start_url\":\"{}\",", manifest.start_url));
1076+ json.push_str(&format!("\"display\":\"{}\"", manifest.display));
1077+ if let Some(ref bg) = manifest.background_color {
1078+ json.push_str(&format!(",\"background_color\":\"{}\"", bg));
1080+ if let Some(ref tc) = manifest.theme_color {
1081+ json.push_str(&format!(",\"theme_color\":\"{}\"", tc));
1083+ if let Some(ref desc) = manifest.description {
1084+ json.push_str(&format!(",\"description\":\"{}\"", desc));
1086+ if !manifest.icons.is_empty() {
1087+ json.push_str(",\"icons\":[");
1088+ for (i, (src, sizes)) in manifest.icons.iter().enumerate() {
1092+ json.push_str(&format!(
1093+ "{{\"src\":\"{}\",\"sizes\":\"{}\",\"type\":\"image/png\"}}",
1101+ // Inline the manifest as a data URI
1102+ let encoded = base64_encode(json.as_bytes());
1105+ "<link rel=\"manifest\" href=\"data:application/manifest+json;base64,{}\">\n",
1110+ "<link rel=\"manifest\" href=\"data:application/manifest+json;base64,{}\">",
1118+ // Preload hints (auto-detect fonts from @font-face)
1119+ let mut preload_html = String::new();
1120+ for (_, url) in &doc.font_faces {
1122+ preload_html.push_str(&format!(
1123+ "<link rel=\"preload\" href=\"{}\" as=\"font\" type=\"font/woff2\" crossorigin>\n",
1127+ preload_html.push_str(&format!(
1128+ "<link rel=\"preload\" href=\"{}\" as=\"font\" type=\"font/woff2\" crossorigin>",
1133+ // Explicit preload hints from the document
1134+ for hint in &doc.preload_hints {
1136+ preload_html.push_str(&format!(
1137+ "<link rel=\"preload\" href=\"{}\" as=\"{}\"{}>\n",
1138+ html_escape(&hint.href),
1140+ if hint.crossorigin { " crossorigin" } else { "" }
1143+ preload_html.push_str(&format!(
1144+ "<link rel=\"preload\" href=\"{}\" as=\"{}\"{}>",
1145+ html_escape(&hint.href),
1147+ if hint.crossorigin { " crossorigin" } else { "" }
1152+ // Auto theme-color meta from @theme primary token
1153+ let theme_color_html = doc
1156+ .find(|(name, _)| name == "primary" || name == "theme-color")
1157+ .map(|(_, value)| {
1160+ "<meta name=\"theme-color\" content=\"{}\">\n",
1165+ "<meta name=\"theme-color\" content=\"{}\">",
1170+ .unwrap_or_default();
1172+ // Focus-visible CSS for interactive elements (accessibility)
1173+ let focus_visible_css = if ctx.has_interactive {
1175+ "a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 2px solid currentColor; outline-offset: 2px; }\n"
1177+ "a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid currentColor;outline-offset:2px}"
1183+ // Skip-to-content CSS (visually hidden but accessible)
1184+ let skip_link_css = if has_main {
1186+ ".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"
1188+ ".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}"
1083 } else {
1190 } else {
1084− format!("@layer {};@layer hl-reset{{{}}}", LAYERS.join(","), rules)
1191+ ""
1194+ // Noscript fallback: show deferred content if JS is disabled
1195+ let noscript_html = if ctx.has_defer {
1197+ "<noscript><style>.hl-defer-placeholder { display: none; }</style></noscript>\n"
1199+ "<noscript><style>.hl-defer-placeholder{display:none}</style></noscript>"
1205+ match &doc.page_title {
1213+<meta charset=\"utf-8\">
1214+<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">
1215+<title>{title}</title>
1216+{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}\
1218+*, *::before, *::after {{ box-sizing: border-box; }}
1219+body {{ margin: 0; font-family: system-ui, -apple-system, sans-serif; }}
1220+img {{ display: block; }}
1221+{focus_visible_css}{skip_link_css}{element_css}\
1230+ title = html_escape(title),
1231+ lang_attr = lang_attr,
1232+ theme_color_html = theme_color_html,
1233+ base_html = base_html,
1234+ canonical_html = canonical_html,
1235+ manifest_html = manifest_html,
1236+ preload_html = preload_html,
1237+ dns_prefetch_html = dns_prefetch_html,
1238+ meta_html = meta_html,
1239+ favicon_html = favicon_html,
1240+ json_ld_html = json_ld_html,
1241+ head_html = head_html,
1243+ focus_visible_css = focus_visible_css,
1244+ skip_link_css = skip_link_css,
1245+ noscript_html = noscript_html,
1246+ element_css = element_css,
1251+ "<!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>",
1252+ title = html_escape(title),
1253+ lang_attr = lang_attr,
1254+ theme_color_html = theme_color_html,
1255+ base_html = base_html,
1256+ canonical_html = canonical_html,
1257+ manifest_html = manifest_html,
1258+ preload_html = preload_html,
1259+ dns_prefetch_html = dns_prefetch_html,
1260+ meta_html = meta_html,
1262+ favicon_html = favicon_html,
1263+ json_ld_html = json_ld_html,
1264+ head_html = head_html,
1265+ focus_visible_css = focus_visible_css,
1266+ skip_link_css = skip_link_css,
1267+ noscript_html = noscript_html,
1268+ element_css = element_css,
1274+ if element_css.is_empty() {
1277+ format!("<style>\n{}</style>\n{}", element_css, body)
1279+ format!("<style>{}</style>{}", element_css, body)
1088/// Generate an HTML fragment: body + optional <style>, no <html>/<head>/<body> wrapper.
1285/// Generate an HTML fragment: body + optional <style>, no <html>/<head>/<body> wrapper.
1089−fn generate_partial_inner(doc: &Document, dev: bool, classes: &mut Vec<Class>) -> String {
1286+fn generate_partial_inner(doc: &Document, dev: bool) -> String {
1090 let mut styles = StyleCollector::new();
1287 let mut styles = StyleCollector::new();
1091 let mut ctx = GenContext {
1288 let mut ctx = GenContext {
1093 depth: 0,
1290 depth: 0,
1094 has_interactive: false,
1292 has_interactive: false,
1095− in_text: false,
1293+ has_defer: false,
1096− flow: Flow::default(),
1099 let mut body = String::new();
1295 let mut body = String::new();
1101− generate_children(&doc.nodes, None, &mut body, &mut styles, &mut ctx);
1297+ for node in &doc.nodes {
1298+ generate_node(node, None, &mut body, &mut styles, &mut ctx);
1301+ let has_custom_css = !doc.custom_css.is_empty();
1302+ let mut element_css = String::new();
1304+ let mut root_vars: Vec<(String, String)> = Vec::new();
1305+ for (name, value) in &doc.css_vars {
1306+ root_vars.push((name.clone(), value.clone()));
1308+ for (name, value) in &doc.theme_tokens {
1309+ let css_name = format!("--{}", name);
1310+ if !root_vars.iter().any(|(n, _)| *n == css_name) {
1311+ root_vars.push((css_name, value.clone()));
1315+ let styles_css = styles.to_css_formatted(dev, !has_custom_css);
1316+ let styles_css = substitute_css_vars(&styles_css, &root_vars);
1317+ let styles_css = if dev {
1320+ let (new_css, auto_vars) = auto_extract_repeats(&styles_css, &root_vars);
1321+ root_vars.extend(auto_vars);
1325+ if !root_vars.is_empty() {
1327+ element_css.push_str(":root {\n");
1328+ for (name, value) in &root_vars {
1329+ element_css.push_str(&format!(" {}: {};\n", name, value));
1331+ element_css.push_str("}\n");
1333+ element_css.push_str(":root{");
1334+ for (name, value) in &root_vars {
1335+ element_css.push_str(name);
1336+ element_css.push(':');
1337+ element_css.push_str(value);
1338+ element_css.push(';');
1340+ element_css.push('}');
1344+ element_css.push_str(&styles_css);
1346+ for (name, kf_body) in &doc.keyframes {
1348+ element_css.push_str(&format!("@keyframes {} {{\n{}\n}}\n", name, kf_body));
1350+ element_css.push_str(&format!("@keyframes {}{{{}}}", name, kf_body));
1103− let mut element_css = build_element_css(doc, &styles, dev);
1354+ for block in &doc.custom_css {
1104− // htmlang's own elements get the reset's rules for elements (which
1355+ if dev {
1105− // also puts htmlang's layers in order)
1356+ element_css.push_str(block);
1106− if !styles.entries.is_empty() || !doc.scoped_css.is_empty() {
1357+ element_css.push('\n');
1107− element_css.insert_str(0, &reset_css(dev, false, ""));
1358+ } else {
1359+ let minified: String = block.lines().map(|l| l.trim()).collect::<Vec<_>>().join("");
1360+ element_css.push_str(&minified);
1109− classes.extend(styles.classes());
1111 if element_css.is_empty() {
1364 if element_css.is_empty() {
@@ -1121,20 +1374,44 @@ fn generate_partial_inner(doc: &Document, dev: bool, classes: &mut Vec<Class>) -
1121// Node generation
1374// Node generation
1122// ---------------------------------------------------------------------------
1375// ---------------------------------------------------------------------------
1124−/// Write `node`, which is inside an element with the layout `parent`
1125−/// (`None` at the top of the page).
1126fn generate_node(
1377fn generate_node(
1127 node: &Node,
1378 node: &Node,
1128− parent: Option<Layout>,
1379+ parent_kind: Option<&ElementKind>,
1129 out: &mut String,
1380 out: &mut String,
1130 styles: &mut StyleCollector,
1381 styles: &mut StyleCollector,
1131 ctx: &mut GenContext,
1382 ctx: &mut GenContext,
1133 match node {
1384 match node {
1134− Node::Element(elem) => generate_element(elem, parent, out, styles, ctx),
1385+ Node::Element(elem) => generate_element(elem, parent_kind, out, styles, ctx),
1135 Node::Text(segments) => {
1386 Node::Text(segments) => {
1136− // In a row, column or grid each line of text is a child
1387+ let needs_wrap = matches!(
1137− let needs_wrap = parent.is_some_and(Layout::is_container);
1388+ parent_kind,
1389+ Some(ElementKind::Row)
1390+ | Some(ElementKind::Column)
1391+ | Some(ElementKind::El)
1392+ | Some(ElementKind::Nav)
1393+ | Some(ElementKind::Header)
1394+ | Some(ElementKind::Footer)
1395+ | Some(ElementKind::Main)
1396+ | Some(ElementKind::Section)
1397+ | Some(ElementKind::Article)
1398+ | Some(ElementKind::Aside)
1399+ | Some(ElementKind::ListItem)
1400+ | Some(ElementKind::Form)
1401+ | Some(ElementKind::Details)
1402+ | Some(ElementKind::Figure)
1403+ | Some(ElementKind::Blockquote)
1404+ | Some(ElementKind::Dialog)
1405+ | Some(ElementKind::DefinitionList)
1406+ | Some(ElementKind::DefinitionDescription)
1407+ | Some(ElementKind::Fieldset)
1408+ | Some(ElementKind::Datalist)
1409+ | Some(ElementKind::Grid)
1410+ | Some(ElementKind::Stack)
1411+ | Some(ElementKind::Noscript)
1412+ | Some(ElementKind::Address)
1413+ | Some(ElementKind::Search)
1138 if needs_wrap {
1415 if needs_wrap {
1139 out.push_str(&ctx.indent());
1416 out.push_str(&ctx.indent());
1140 out.push_str("<span>");
1417 out.push_str("<span>");
@@ -1153,191 +1430,197 @@ fn generate_node(
1156−/// What goes between two things written one after the other in an element
1433+/// HTML attributes that are passed through to the HTML tag rather than converted to CSS.
1157−/// with this layout (`None`: the top of the page): text flows, so its lines
1434+const HTML_PASSTHROUGH_ATTRS: &[&str] = &[
1158−/// and children are joined with a space; in HTML's own layout, and at the
1435+ "type",
1159−/// top of the page, two lines of text are separated by a line break (a
1436+ "placeholder",
1160−/// space, except where whitespace is kept, as in `@pre`).
1437+ "name",
1161−fn separator(layout: Option<Layout>, previous_is_text: bool, next: &Node) -> Option<char> {
1438+ "value",
1162− match layout {
1439+ "disabled",
1163− Some(Layout::Text) => Some(' '),
1440+ "required",
1164− Some(Layout::Native) | None if previous_is_text && matches!(next, Node::Text(_)) => {
1441+ "checked",
1165− Some('\n')
1442+ "for",
1167− _ => None,
1444+ "method",
1168− }
1445+ "autocomplete",
1467+ // Image optimization
1470+ // Media src (explicit attribute form)
1472+ // New element attributes
1493+ "popovertargetaction",
1494+ // Modern form/input hints
1497+ // Performance hints
1503+ // ARIA live regions
1171−/// Write the children of an element (or of a `@fragment`, which has no
1509+/// Boolean HTML attributes (rendered without a value, e.g., `<input disabled>`).
1172−/// element of its own) laid out as `layout` (`None`: the top of the page).
1510+const BOOLEAN_HTML_ATTRS: &[&str] = &[
1173−/// The first line of an element's text is its first child.
1511+ "disabled",
1174−fn generate_children(
1512+ "required",
1175− children: &[Node],
1513+ "checked",
1176− layout: Option<Layout>,
1514+ "multiple",
1177− out: &mut String,
1515+ "controls",
1178− styles: &mut StyleCollector,
1516+ "autoplay",
1179− ctx: &mut GenContext,
1517+ "loop",
1181− generate_run(children, layout, &mut None, out, styles, ctx);
1519+ "playsinline",
1184−/// [`generate_children`], with `previous` saying whether what was written
1530+fn emit_html_passthrough_attrs(out: &mut String, attrs: &[Attribute]) {
1185−/// last was a line of text (`None`: nothing yet). A `@fragment`'s children
1531+ for attr in attrs {
1186−/// are written as if they stood in its place, so its lines are separated
1532+ let key = attr.key.as_str();
1187−/// from the lines around it like any other lines.
1533+ let is_passthrough = HTML_PASSTHROUGH_ATTRS.contains(&key)
1188−fn generate_run(
1534+ || key.starts_with("aria-")
1189− children: &[Node],
1535+ || key.starts_with("data-");
1190− layout: Option<Layout>,
1536+ if !is_passthrough {
1191− previous: &mut Option<bool>,
1193− styles: &mut StyleCollector,
1194− ctx: &mut GenContext,
1196− for child in children {
1197− if let Node::Element(elem) = child
1198− && elem.kind == ElementKind::Fragment
1200− generate_run(&elem.children, layout, previous, out, styles, ctx);
1201 continue;
1537 continue;
1203− let start = out.len();
1539+ if BOOLEAN_HTML_ATTRS.contains(&key) && attr.value.is_none() {
1204− if let Some(previous_is_text) = *previous
1540+ out.push(' ');
1205− && let Some(sep) = separator(layout, previous_is_text, child)
1541+ out.push_str(key);
1206− {
1542+ } else if let Some(val) = &attr.value {
1207− out.push(sep);
1543+ out.push(' ');
1208− }
1544+ out.push_str(key);
1209− let body = out.len();
1545+ out.push_str("=\"");
1210− generate_node(child, layout, out, styles, ctx);
1546+ out.push_str(&html_escape(strip_string_quotes(val)));
1211− // A child that writes nothing (an empty `@fragment`) takes no
1547+ out.push('"');
1212− // separator either, so text never gets two spaces in a row
1213− if out.len() == body {
1214− out.truncate(start);
1217− *previous = Some(matches!(child, Node::Text(_)));
1221−/// Emit the element's leading argument as its attribute (`@iframe URL` →
1552+/// If the value is wrapped in a single pair of matching quotes (e.g.
1222−/// `src="URL"`, `@form /submit` → `action="/submit"`, `@link /a` →
1553+/// `"Avatar"`), return the inner content. Quotes act as source-level
1223−/// `href="/a"`), first, before the class. `@image [inline] photo.png` puts
1554+/// delimiters in the `.hl` syntax and shouldn't leak into HTML attribute
1224−/// the file itself into the page.
1555+/// values. Multi-quoted values like `"h h" "s m"` are left unchanged —
1225−fn emit_argument_attr(out: &mut String, elem: &Element, in_picture: bool) {
1556+/// those are real string tokens (used e.g. by CSS `grid-template-areas`).
1226− let (Some(attr), Some(value)) = (elem.kind.leading_attribute(in_picture), &elem.argument)
1557+fn strip_string_quotes(val: &str) -> &str {
1227− else {
1558+ let bytes = val.as_bytes();
1228− return;
1559+ if bytes.len() < 2 {
1229− };
1560+ return val;
1230− // `@image [inline]`'s file is already a `data:` URI (see the parser)
1231− let value = html_escape(value);
1233− out.push_str(attr);
1234− out.push_str("=\"");
1235− out.push_str(&value);
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
1244− .map(str::to_ascii_lowercase)
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",
1256− format!("data:{};base64,{}", mime, base64_encode(data))
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);
1268−}
1562+ let first = bytes[0];
1269−
1563+ let last = bytes[bytes.len() - 1];
1270−/// The HTML attributes of `attrs`, `key=value` ones and flags, each name
1564+ if (first == b'"' && last == b'"') || (first == b'\'' && last == b'\'') {
1271−/// once: the later one wins, as a style does. (Of two attributes with one
1565+ let inner = &val[1..val.len() - 1];
1272−/// name, the browser keeps the first, so a bundle's attribute or a
1566+ if !inner.as_bytes().contains(&first) {
1273−/// function's own would win over one written after it.)
1567+ return inner;
1274−fn html_attrs(attrs: &[Attribute]) -> impl Iterator<Item = &Attribute> {
1568+ }
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..]
1280− .any(|other| is_html(other) && other.key == attr.key);
1281− (is_html(attr) && !later).then_some(attr)
1285−/// ` key="value"`, or ` key` for a flag.
1286−fn push_html_attr(out: &mut String, attr: &Attribute) {
1288− out.push_str(&attr.key);
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("")));
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)
1304−fn holds_overlays(children: &[Node]) -> bool {
1305− children.iter().any(|child| {
1308− Node::Element(e) if e.kind.is_tag("in-front") || e.kind.is_tag("behind")
1313fn generate_element(
1573fn generate_element(
1314 elem: &Element,
1574 elem: &Element,
1315− parent: Option<Layout>,
1575+ parent_kind: Option<&ElementKind>,
1316 out: &mut String,
1576 out: &mut String,
1317 styles: &mut StyleCollector,
1577 styles: &mut StyleCollector,
1318 ctx: &mut GenContext,
1578 ctx: &mut GenContext,
1320 // Self-closing elements
1580 // Self-closing elements
1321− if elem.kind.layout() == Layout::Void {
1581+ if matches!(
1322− generate_self_closing(elem, parent, out, styles, ctx);
1582+ elem.kind,
1584+ | ElementKind::Input
1585+ | ElementKind::HorizontalRule
1586+ | ElementKind::Source
1587+ | ElementKind::Spacer
1589+ generate_self_closing(elem, parent_kind, out, styles, ctx);
1325− // A verbatim element (@script) writes its body as it is, with no HTML
1592+ // @script renders as <script> with raw body content (no HTML escaping)
1326− // escaping; it isn't shown, so it has no class (its styles are an error)
1593+ if elem.kind == ElementKind::Script {
1327− if elem.kind.is_verbatim() {
1328− let tag = elem.kind.spec().map_or("script", |spec| spec.html);
1329 out.push_str(&ctx.indent());
1594 out.push_str(&ctx.indent());
1330− out.push('<');
1595+ out.push_str("<script");
1331− out.push_str(tag);
1596+ // Pass through src, type, defer, async, etc.
1332− emit_argument_attr(out, elem, false);
1597+ for attr in &elem.attrs {
1333− let (id, class) = extract_id_class(&elem.attrs);
1598+ let key = attr.key.as_str();
1334− for (key, value) in [("id", id), ("class", class)] {
1599+ if matches!(
1335− if let Some(value) = value {
1600+ key,
1336− out.push_str(&format!(" {}=\"{}\"", key, html_escape(&value)));
1601+ "src"
1610+ if let Some(val) = &attr.value {
1613+ out.push_str("=\"");
1614+ out.push_str(&html_escape(val));
1339− emit_html_attrs(out, &elem.attrs);
1340 out.push('>');
1622 out.push('>');
1623+ // Children are raw JS code, not HTML
1341 for child in &elem.children {
1624 for child in &elem.children {
1342 match child {
1625 match child {
1343 Node::Text(segments) => {
1626 Node::Text(segments) => {
@@ -1351,10 +1634,46 @@ fn generate_element(
1354− out.push_str("</");
1637+ out.push_str("</script>");
1355− out.push_str(tag);
1638+ out.push_str(ctx.nl());
1641+ // @breadcrumb generates semantic <nav aria-label="breadcrumb"><ol>...</ol></nav>
1642+ if elem.kind == ElementKind::Breadcrumb {
1643+ let gen_class = compute_class(&elem.attrs, &elem.kind, parent_kind, styles);
1644+ let (id, user_class) = extract_id_class(&elem.attrs);
1645+ out.push_str(&ctx.indent());
1646+ out.push_str("<nav aria-label=\"breadcrumb\"");
1647+ emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
1648+ if let Some(id) = id {
1649+ out.push_str(" id=\"");
1650+ out.push_str(&html_escape(&id));
1356 out.push('>');
1653 out.push('>');
1357 out.push_str(ctx.nl());
1654 out.push_str(ctx.nl());
1656+ out.push_str(&ctx.indent());
1657+ out.push_str("<ol>");
1658+ out.push_str(ctx.nl());
1660+ for child in &elem.children {
1661+ out.push_str(&ctx.indent());
1662+ out.push_str("<li>");
1663+ let mut buf = String::new();
1664+ generate_node(child, Some(&elem.kind), &mut buf, styles, ctx);
1665+ out.push_str(buf.trim());
1666+ out.push_str("</li>");
1667+ out.push_str(ctx.nl());
1670+ out.push_str(&ctx.indent());
1671+ out.push_str("</ol>");
1672+ out.push_str(ctx.nl());
1674+ out.push_str(&ctx.indent());
1675+ out.push_str("</nav>");
1676+ out.push_str(ctx.nl());
1360 if elem.kind == ElementKind::Children {
1679 if elem.kind == ElementKind::Children {
@@ -1364,38 +1683,185 @@ fn generate_element(
1366 if elem.kind == ElementKind::Fragment {
1685 if elem.kind == ElementKind::Fragment {
1367− // Render children without a wrapper element, as if they were
1686+ // Render children without a wrapper element
1368− // written where the fragment is
1687+ for child in &elem.children {
1369− generate_children(&elem.children, parent, out, styles, ctx);
1688+ generate_node(child, parent_kind, out, styles, ctx);
1373− let mut own = Flow::of(elem);
1374 let tag = match &elem.kind {
1693 let tag = match &elem.kind {
1375− ElementKind::Row | ElementKind::El => "div",
1694+ ElementKind::Row
1695+ | ElementKind::Column
1697+ | ElementKind::Grid
1698+ | ElementKind::Stack => "div",
1376 ElementKind::Text => "span",
1699 ElementKind::Text => "span",
1377 ElementKind::Paragraph => "p",
1700 ElementKind::Paragraph => "p",
1378 ElementKind::Link => "a",
1701 ElementKind::Link => "a",
1379− ElementKind::Tag(spec) => spec.html,
1702+ ElementKind::Button => "button",
1703+ ElementKind::Select => "select",
1704+ ElementKind::Textarea => "textarea",
1705+ ElementKind::Option => "option",
1706+ ElementKind::Label => "label",
1707+ // Semantic elements
1708+ ElementKind::Nav => "nav",
1709+ ElementKind::Header => "header",
1710+ ElementKind::Footer => "footer",
1711+ ElementKind::Main => "main",
1712+ ElementKind::Section => "section",
1713+ ElementKind::Article => "article",
1714+ ElementKind::Aside => "aside",
1716+ ElementKind::List => {
1717+ if elem.attrs.iter().any(|a| a.key == "ordered") {
1723+ ElementKind::ListItem => "li",
1725+ ElementKind::Table => "table",
1726+ ElementKind::TableHead => "thead",
1727+ ElementKind::TableBody => "tbody",
1728+ ElementKind::TableRow => "tr",
1729+ ElementKind::TableCell => "td",
1730+ ElementKind::TableHeaderCell => "th",
1732+ ElementKind::Video => "video",
1733+ ElementKind::Audio => "audio",
1734+ // Additional semantic elements
1735+ ElementKind::Form => "form",
1736+ ElementKind::Details => "details",
1737+ ElementKind::Summary => "summary",
1738+ ElementKind::Blockquote => "blockquote",
1739+ ElementKind::Cite => "cite",
1740+ ElementKind::Code => "code",
1741+ ElementKind::Pre => "pre",
1742+ ElementKind::Figure => "figure",
1743+ ElementKind::FigCaption => "figcaption",
1744+ ElementKind::Progress => "progress",
1745+ ElementKind::Meter => "meter",
1747+ ElementKind::Dialog => "dialog",
1748+ ElementKind::DefinitionList => "dl",
1749+ ElementKind::DefinitionTerm => "dt",
1750+ ElementKind::DefinitionDescription => "dd",
1751+ ElementKind::Fieldset => "fieldset",
1752+ ElementKind::Legend => "legend",
1753+ ElementKind::Picture => "picture",
1754+ ElementKind::Time => "time",
1755+ ElementKind::Mark => "mark",
1756+ ElementKind::Kbd => "kbd",
1757+ ElementKind::Abbr => "abbr",
1758+ ElementKind::Datalist => "datalist",
1759+ ElementKind::Iframe => "iframe",
1760+ ElementKind::Output => "output",
1761+ ElementKind::Canvas => "canvas",
1762+ ElementKind::Badge => "span",
1763+ ElementKind::Tooltip => "span",
1764+ ElementKind::Avatar => "div",
1765+ ElementKind::Carousel => "div",
1766+ ElementKind::Chip => "span",
1767+ ElementKind::Tag => "span",
1768+ ElementKind::Noscript => "noscript",
1769+ ElementKind::Address => "address",
1770+ ElementKind::Search => "search",
1772+ | ElementKind::Input
1773+ | ElementKind::HorizontalRule
1774+ | ElementKind::Children
1775+ | ElementKind::Slot(_)
1776+ | ElementKind::Fragment
1777+ | ElementKind::Source
1778+ | ElementKind::Spacer
1779+ | ElementKind::Script
1780+ | ElementKind::Breadcrumb => unreachable!(),
1783+ let kind_label = match elem.kind {
1784+ ElementKind::Row => "row",
1785+ ElementKind::Column => "column",
1786+ ElementKind::El => "el",
1787+ ElementKind::Text => "text",
1788+ ElementKind::Paragraph => "paragraph",
1789+ ElementKind::Link => "link",
1790+ ElementKind::Button => "button",
1791+ ElementKind::Select => "select",
1792+ ElementKind::Textarea => "textarea",
1793+ ElementKind::Option => "option",
1794+ ElementKind::Label => "label",
1795+ ElementKind::Nav => "nav",
1796+ ElementKind::Header => "header",
1797+ ElementKind::Footer => "footer",
1798+ ElementKind::Main => "main",
1799+ ElementKind::Section => "section",
1800+ ElementKind::Article => "article",
1801+ ElementKind::Aside => "aside",
1802+ ElementKind::List => "list",
1803+ ElementKind::ListItem => "item",
1804+ ElementKind::Table => "table",
1805+ ElementKind::TableHead => "thead",
1806+ ElementKind::TableBody => "tbody",
1807+ ElementKind::TableRow => "tr",
1808+ ElementKind::TableCell => "td",
1809+ ElementKind::TableHeaderCell => "th",
1810+ ElementKind::Video => "video",
1811+ ElementKind::Audio => "audio",
1812+ ElementKind::Form => "form",
1813+ ElementKind::Details => "details",
1814+ ElementKind::Summary => "summary",
1815+ ElementKind::Blockquote => "blockquote",
1816+ ElementKind::Cite => "cite",
1817+ ElementKind::Code => "code",
1818+ ElementKind::Pre => "pre",
1819+ ElementKind::Figure => "figure",
1820+ ElementKind::FigCaption => "figcaption",
1821+ ElementKind::Fragment => "fragment",
1822+ ElementKind::Dialog => "dialog",
1823+ ElementKind::DefinitionList => "dl",
1824+ ElementKind::DefinitionTerm => "dt",
1825+ ElementKind::DefinitionDescription => "dd",
1826+ ElementKind::Fieldset => "fieldset",
1827+ ElementKind::Legend => "legend",
1828+ ElementKind::Picture => "picture",
1829+ ElementKind::Time => "time",
1830+ ElementKind::Mark => "mark",
1831+ ElementKind::Kbd => "kbd",
1832+ ElementKind::Abbr => "abbr",
1833+ ElementKind::Datalist => "datalist",
1834+ ElementKind::Iframe => "iframe",
1835+ ElementKind::Output => "output",
1836+ ElementKind::Canvas => "canvas",
1837+ ElementKind::Grid => "grid",
1838+ ElementKind::Stack => "stack",
1839+ ElementKind::Badge => "badge",
1840+ ElementKind::Tooltip => "tooltip",
1841+ ElementKind::Avatar => "avatar",
1842+ ElementKind::Carousel => "carousel",
1843+ ElementKind::Chip => "chip",
1844+ ElementKind::Tag => "tag",
1845+ ElementKind::Noscript => "noscript",
1846+ ElementKind::Address => "address",
1847+ ElementKind::Search => "search",
1380 _ => "",
1848 _ => "",
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();
1389 // Track interactive elements for focus-visible CSS
1851 // Track interactive elements for focus-visible CSS
1390− if elem.kind == ElementKind::Link
1852+ if matches!(
1391− || matches!(kind_label, "button" | "input" | "select" | "textarea")
1853+ elem.kind,
1392− {
1854+ ElementKind::Link
1855+ | ElementKind::Button
1856+ | ElementKind::Input
1857+ | ElementKind::Select
1858+ | ElementKind::Textarea
1393 ctx.has_interactive = true;
1860 ctx.has_interactive = true;
1396 // Compute CSS for each state and get a class name
1863 // Compute CSS for each state and get a class name
1397− let gen_class = element_class(elem, &Site::new(elem, parent, &ctx.flow), styles);
1864+ let gen_class = compute_class(&elem.attrs, &elem.kind, parent_kind, styles);
1398− own.class = gen_class.clone();
1399 let (id, user_class) = extract_id_class(&elem.attrs);
1865 let (id, user_class) = extract_id_class(&elem.attrs);
1401 if ctx.dev && elem.line_num > 0 {
1867 if ctx.dev && elem.line_num > 0 {
@@ -1409,17 +1875,93 @@ fn generate_element(
1409 out.push('<');
1875 out.push('<');
1410 out.push_str(tag);
1876 out.push_str(tag);
1412− emit_argument_attr(out, elem, ctx.in_picture);
1878+ // @main gets id="hl-main" for skip-to-content link (unless user set an id)
1413−
1879+ if elem.kind == ElementKind::Main && id.is_none() {
1414− emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
1880+ out.push_str(" id=\"hl-main\"");
1416− if let Some(id) = id {
1417− out.push_str(" id=\"");
1418− out.push_str(&html_escape(&id));
1422− emit_html_attrs(out, &elem.attrs);
1883+ if elem.kind == ElementKind::Link
1884+ && let Some(url) = &elem.argument
1886+ out.push_str(" href=\"");
1887+ out.push_str(&html_escape(url));
1889+ // Auto rel="noopener noreferrer" and target="_blank" for external links
1890+ let is_external = url.starts_with("http://") || url.starts_with("https://");
1892+ let has_rel = elem.attrs.iter().any(|a| a.key == "rel");
1893+ let has_target = elem.attrs.iter().any(|a| a.key == "target");
1895+ out.push_str(" rel=\"noopener noreferrer\"");
1898+ out.push_str(" target=\"_blank\"");
1904+ if matches!(elem.kind, ElementKind::Video | ElementKind::Audio)
1905+ && let Some(src) = &elem.argument
1907+ out.push_str(" src=\"");
1908+ out.push_str(&html_escape(src));
1913+ if elem.kind == ElementKind::Form
1914+ && let Some(action) = &elem.argument
1916+ out.push_str(" action=\"");
1917+ out.push_str(&html_escape(action));
1922+ if elem.kind == ElementKind::Iframe
1923+ && let Some(src) = &elem.argument
1925+ out.push_str(" src=\"");
1926+ out.push_str(&html_escape(src));
1931+ if elem.kind == ElementKind::Tooltip
1932+ && let Some(text) = &elem.argument
1934+ out.push_str(" title=\"");
1935+ out.push_str(&html_escape(text));
1939+ // Critical CSS: inline styles directly instead of using a class
1940+ let is_critical = elem.attrs.iter().any(|a| a.key == "critical");
1942+ let inline_css = attrs_to_css(&elem.attrs, "", &elem.kind, parent_kind);
1943+ if !inline_css.is_empty() {
1944+ out.push_str(" style=\"");
1945+ out.push_str(&html_escape(&inline_css));
1948+ // Still use class for non-base styles (pseudo, responsive, etc.)
1949+ if gen_class.as_deref().is_some_and(|c| !c.is_empty()) {
1950+ emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
1951+ } else if let Some(ref uc) = user_class {
1952+ emit_class_attr(out, None, Some(uc));
1955+ emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
1958+ if let Some(id) = id {
1959+ out.push_str(" id=\"");
1960+ out.push_str(&html_escape(&id));
1964+ emit_html_passthrough_attrs(out, &elem.attrs);
1424 // Source map attributes in dev mode
1966 // Source map attributes in dev mode
1425 if ctx.dev && elem.line_num > 0 {
1967 if ctx.dev && elem.line_num > 0 {
@@ -1430,27 +1972,51 @@ fn generate_element(
1432 out.push('>');
1974 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");
1438 out.push_str(ctx.nl());
1975 out.push_str(ctx.nl());
1440− let layout = elem.kind.layout();
1977+ // Inline text argument
1981+ | ElementKind::Button
1982+ | ElementKind::Label
1983+ | ElementKind::Option
1984+ | ElementKind::Textarea
1985+ | ElementKind::ListItem
1986+ | ElementKind::TableCell
1987+ | ElementKind::TableHeaderCell
1988+ | ElementKind::Summary
1989+ | ElementKind::Cite
1990+ | ElementKind::Code
1991+ | ElementKind::FigCaption
1992+ | ElementKind::Legend
1993+ | ElementKind::DefinitionTerm
1994+ | ElementKind::Mark
1996+ | ElementKind::Abbr
1997+ | ElementKind::Time
1998+ | ElementKind::DefinitionDescription
1999+ | ElementKind::Badge
2000+ | ElementKind::Tooltip
2001+ | ElementKind::Chip
2003+ ) && let Some(text) = &elem.argument
2005+ out.push_str(&html_escape(text));
1441 ctx.depth += 1;
2009 ctx.depth += 1;
1442− let outer_in_text = ctx.in_text;
2010+ let is_paragraph = elem.kind == ElementKind::Paragraph;
1443− ctx.in_text = in_text || layout == Layout::Text;
2011+ for (i, child) in elem.children.iter().enumerate() {
1444− let outer_flow = std::mem::replace(&mut ctx.flow, own);
2012+ generate_node(child, Some(&elem.kind), out, styles, ctx);
1445− let outer_picture = std::mem::replace(&mut ctx.in_picture, elem.kind.is_tag("picture"));
2013+ if is_paragraph && i < elem.children.len() - 1 {
1446− generate_children(&elem.children, Some(layout), out, styles, ctx);
2014+ out.push(' ');
1447− ctx.in_picture = outer_picture;
2015+ }
1448− ctx.flow = outer_flow;
2016+ }
1449− ctx.in_text = outer_in_text;
1450 ctx.depth -= 1;
2017 ctx.depth -= 1;
1452 out.push_str(&ctx.indent());
2019 out.push_str(&ctx.indent());
1453− ctx.dev = outer_dev;
1454 out.push_str("</");
2020 out.push_str("</");
1455 out.push_str(tag);
2021 out.push_str(tag);
1456 out.push('>');
2022 out.push('>');
@@ -1459,18 +2025,21 @@ fn generate_element(
1460fn generate_self_closing(
2026fn generate_self_closing(
1461 elem: &Element,
2027 elem: &Element,
1462− parent: Option<Layout>,
2028+ parent_kind: Option<&ElementKind>,
1463 out: &mut String,
2029 out: &mut String,
1464 styles: &mut StyleCollector,
2030 styles: &mut StyleCollector,
1465 ctx: &mut GenContext,
2031 ctx: &mut GenContext,
1467− let gen_class = element_class(elem, &Site::new(elem, parent, &ctx.flow), styles);
2033+ let gen_class = compute_class(&elem.attrs, &elem.kind, parent_kind, styles);
1468 let (id, user_class) = extract_id_class(&elem.attrs);
2034 let (id, user_class) = extract_id_class(&elem.attrs);
1470− let (tag, kind_label) = match &elem.kind {
2036+ let (tag, kind_label) = match elem.kind {
1471 ElementKind::Image => ("img", "image"),
2037 ElementKind::Image => ("img", "image"),
1472− ElementKind::Tag(spec) => (spec.html, spec.name),
2038+ ElementKind::Input => ("input", "input"),
1473− _ => unreachable!("not a void element: {:?}", elem.kind),
2039+ ElementKind::HorizontalRule => ("hr", "hr"),
2040+ ElementKind::Source => ("source", "source"),
2041+ ElementKind::Spacer => ("div", "spacer"),
2042+ _ => unreachable!(),
1476 if ctx.dev && elem.line_num > 0 {
2045 if ctx.dev && elem.line_num > 0 {
@@ -1483,7 +2052,43 @@ fn generate_self_closing(
1483 out.push_str(&ctx.indent());
2052 out.push_str(&ctx.indent());
1484 out.push('<');
2053 out.push('<');
1485 out.push_str(tag);
2054 out.push_str(tag);
1486− emit_argument_attr(out, elem, ctx.in_picture);
2055+
2056+ // Image src (with optional non-SVG base64 inlining)
2057+ if elem.kind == ElementKind::Image {
2058+ let src = elem.argument.as_deref().unwrap_or("");
2059+ let is_inline = elem.attrs.iter().any(|a| a.key == "inline");
2060+ if is_inline && !src.is_empty() && !src.ends_with(".svg") {
2061+ let mime = if src.ends_with(".png") {
2063+ } else if src.ends_with(".jpg") || src.ends_with(".jpeg") {
2065+ } else if src.ends_with(".gif") {
2067+ } else if src.ends_with(".webp") {
2069+ } else if src.ends_with(".avif") {
2072+ "application/octet-stream"
2074+ if let Ok(data) = std::fs::read(src) {
2075+ let b64 = base64_encode(&data);
2076+ out.push_str(" src=\"data:");
2077+ out.push_str(mime);
2078+ out.push_str(";base64,");
2079+ out.push_str(&b64);
2082+ out.push_str(" src=\"");
2083+ out.push_str(&html_escape(src));
2087+ out.push_str(" src=\"");
2088+ out.push_str(&html_escape(src));
1488 emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
2093 emit_class_attr(out, gen_class.as_deref(), user_class.as_deref());
@@ -1493,7 +2098,7 @@ fn generate_self_closing(
1493 out.push('"');
2098 out.push('"');
1496− emit_html_attrs(out, &elem.attrs);
2101+ emit_html_passthrough_attrs(out, &elem.attrs);
1498 // Source map attributes in dev mode (self-closing)
2103 // Source map attributes in dev mode (self-closing)
1499 if ctx.dev && elem.line_num > 0 {
2104 if ctx.dev && elem.line_num > 0 {
@@ -1503,6 +2108,93 @@ fn generate_self_closing(
2111+ // Image optimization: auto-add loading="lazy" and decoding="async"
2112+ if elem.kind == ElementKind::Image {
2113+ // SVG inlining: @image [inline] logo.svg
2114+ if elem.attrs.iter().any(|a| a.key == "inline")
2115+ && let Some(src) = &elem.argument
2116+ && src.ends_with(".svg")
2117+ && let Ok(svg_content) = std::fs::read_to_string(src)
2119+ // Close the tag we opened, then emit inline SVG instead
2120+ out.truncate(out.rfind('<').unwrap_or(0));
2121+ out.push_str(&ctx.indent());
2122+ out.push_str(svg_content.trim());
2123+ out.push_str(ctx.nl());
2126+ // Responsive srcset: @image photo.jpg [responsive 400 800 1200]
2127+ let responsive_attr = elem.attrs.iter().find(|a| a.key == "responsive");
2128+ if let Some(resp) = responsive_attr
2129+ && let Some(ref sizes_str) = resp.value
2131+ let widths: Vec<&str> = sizes_str.split_whitespace().collect();
2132+ if !widths.is_empty() {
2133+ let src = elem.argument.as_deref().unwrap_or("");
2134+ if !src.is_empty() {
2135+ // Generate srcset with width descriptors
2136+ // Convention: file-{width}.ext (e.g., photo-400.jpg)
2137+ let dot_pos = src.rfind('.').unwrap_or(src.len());
2138+ let base = &src[..dot_pos];
2139+ let ext = &src[dot_pos..];
2140+ let mut srcset_parts = Vec::new();
2142+ srcset_parts.push(format!("{}-{}{} {}w", base, w, ext, w));
2144+ out.push_str(" srcset=\"");
2145+ out.push_str(&srcset_parts.join(", "));
2147+ // Generate sizes attribute
2148+ let max_width = widths.last().unwrap_or(&"100vw");
2149+ out.push_str(&format!(
2150+ " sizes=\"(max-width: {}px) 100vw, {}px\"",
2151+ max_width, max_width
2157+ // Auto image dimensions: read local image file to inject width/height + aspect-ratio
2158+ let has_width = elem.attrs.iter().any(|a| a.key == "width");
2159+ let has_height = elem.attrs.iter().any(|a| a.key == "height");
2160+ if (!has_width || !has_height)
2161+ && let Some(ref src) = elem.argument
2162+ && !src.starts_with("http://")
2163+ && !src.starts_with("https://")
2164+ && !src.starts_with("data:")
2165+ && let Some((w, h)) = read_image_dimensions(src)
2168+ out.push_str(&format!(" width=\"{}\"", w));
2171+ out.push_str(&format!(" height=\"{}\"", h));
2173+ // Auto aspect-ratio to prevent CLS
2174+ if !elem.attrs.iter().any(|a| a.key == "aspect-ratio") {
2175+ out.push_str(&format!(" style=\"aspect-ratio:{}/{}\"", w, h));
2179+ // Smart image loading: first 3 images get fetchpriority="high" (above the fold),
2180+ // subsequent images get loading="lazy" + decoding="async"
2181+ ctx.image_count += 1;
2182+ if ctx.image_count <= 3 {
2183+ // Above-the-fold: eager loading with high priority
2184+ if !elem.attrs.iter().any(|a| a.key == "fetchpriority") {
2185+ out.push_str(" fetchpriority=\"high\"");
2188+ // Below-the-fold: lazy loading
2189+ if !elem.attrs.iter().any(|a| a.key == "loading") {
2190+ out.push_str(" loading=\"lazy\"");
2192+ if !elem.attrs.iter().any(|a| a.key == "decoding") {
2193+ out.push_str(" decoding=\"async\"");
1506 out.push('>');
2198 out.push('>');
1507 out.push_str(ctx.nl());
2199 out.push_str(ctx.nl());
@@ -1518,10 +2210,7 @@ fn generate_text_segments(
1518 TextSegment::Plain(text) => out.push_str(&html_escape(text)),
2210 TextSegment::Plain(text) => out.push_str(&html_escape(text)),
1519 TextSegment::Inline(elem) => {
2211 TextSegment::Inline(elem) => {
1520 let mut buf = String::new();
2212 let mut buf = String::new();
1521− // An element inside a line of text is in text
2213+ generate_element(elem, None, &mut buf, styles, ctx);
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;
1525 out.push_str(buf.trim_end());
2214 out.push_str(buf.trim_end());
@@ -1534,97 +2223,141 @@ fn generate_text_segments(
1535fn compute_class(
2224fn compute_class(
1536 attrs: &[Attribute],
2225 attrs: &[Attribute],
1537− site: &Site,
2226+ kind: &ElementKind,
2227+ parent_kind: Option<&ElementKind>,
1538 styles: &mut StyleCollector,
2228 styles: &mut StyleCollector,
1540) -> Option<String> {
2229) -> Option<String> {
1541− // Every condition an attribute is under, and none
2230+ let base = attrs_to_css(attrs, "", kind, parent_kind);
1542− let mut conditions = vec![Condition::default()];
2231+
1543− for attr in attrs.iter().filter(|a| !a.html) {
2232+ // Collect pseudo-state overrides
1544− let (condition, _) = Condition::of(&attr.key);
2233+ let mut pseudo = Vec::new();
1545− if !conditions.contains(&condition) {
2234+ for &(prefix, selector) in PSEUDO_PREFIXES {
1546− conditions.push(condition);
2235+ let css = attrs_to_css(attrs, prefix, kind, parent_kind);
2236+ if !css.is_empty() {
2237+ pseudo.push((selector.to_string(), css));
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
1554− let css = dedupe_declarations(&attrs_to_css(attrs, &condition, site));
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)
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)
1570− styles.get_class(defaults, rules, distinct)
1573−/// The defaults of an element's kind where it is: an overlay's positioning
2241+ // Auto-add ::-webkit-scrollbar pseudo for no-scrollbar attribute
1574−/// context, its layout, and its kind's own CSS (a heading's `margin:0`).
2242+ if attrs.iter().any(|a| a.key == "no-scrollbar") {
1575−fn default_css(site: &Site) -> String {
2243+ pseudo.push((
1576− let mut css = String::new();
2244+ "::-webkit-scrollbar".to_string(),
1577− // Elements with @in-front / @behind children become positioning
2245+ "display:none;".to_string(),
1578− // contexts
2246+ ));
1579− if site.has_overlay_children {
1580− css.push_str("position:relative;isolation:isolate;");
1583− css.push_str(layout_css(site.kind.layout(), site.inline));
1585− css.push_str(site.kind.css());
1589−/// The declarations of a rule body, as (property, `property:value;`), for
2249+ // Collect nth:EXPR: dynamic pseudo selectors
1590−/// bodies htmlang wrote: every declaration ends in `;`, and a `;` inside
2250+ let mut nth_prefixes: Vec<String> = Vec::new();
1591−/// quotes or parentheses doesn't end one.
2251+ for attr in attrs {
1592−fn declarations(css: &str) -> impl Iterator<Item = (&str, &str)> {
2252+ if attr.key.starts_with("nth:") {
1593− let mut rest = css;
2253+ let rest = &attr.key[4..];
1594− std::iter::from_fn(move || {
2254+ if let Some(colon_pos) = rest.find(':') {
1595− if rest.is_empty() {
2255+ let prefix = format!("nth:{}:", &rest[..colon_pos]);
1596− return None;
2256+ if !nth_prefixes.contains(&prefix) {
1597− }
2257+ nth_prefixes.push(prefix);
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() {
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),
1609− ';' if depth == 0 => {
1616− let (declaration, after) = rest.split_at(end);
2261+ }
1617− rest = after;
2262+ for prefix in &nth_prefixes {
1618− let name = declaration.split(':').next().unwrap_or("").trim();
2263+ let expr = &prefix[4..prefix.len() - 1];
1619− Some((name, declaration))
2264+ let selector = format!(":nth-child({})", expr);
1620− })
2265+ let css = attrs_to_css(attrs, prefix, kind, parent_kind);
2266+ if !css.is_empty() {
2267+ pseudo.push((selector, css));
2271+ // Collect has(...): dynamic pseudo selectors
2272+ let mut has_prefixes: Vec<String> = Vec::new();
2273+ for attr in attrs {
2274+ if attr.key.starts_with("has(")
2275+ && let Some(close) = attr.key.find("):")
2277+ let prefix = format!("{}:", &attr.key[..close + 1]);
2278+ if !has_prefixes.contains(&prefix) {
2279+ has_prefixes.push(prefix);
2283+ for prefix in &has_prefixes {
2284+ let inner = &prefix[4..prefix.len() - 2]; // extract selector from has(selector):
2285+ let selector = format!(":has({})", inner);
2286+ let css = attrs_to_css(attrs, prefix, kind, parent_kind);
2287+ if !css.is_empty() {
2288+ pseudo.push((selector, css));
2292+ // Collect responsive overrides
2293+ let mut responsive = Vec::new();
2294+ for &(bp_name, _) in BREAKPOINTS {
2295+ let prefix = format!("{}:", bp_name);
2296+ let css = attrs_to_css(attrs, &prefix, kind, parent_kind);
2297+ if !css.is_empty() {
2298+ responsive.push((bp_name.to_string(), css));
2302+ // Collect container query overrides
2303+ let mut container = Vec::new();
2304+ for &(bp_name, _) in BREAKPOINTS {
2305+ let prefix = format!("cq-{}:", bp_name);
2306+ let css = attrs_to_css(attrs, &prefix, kind, parent_kind);
2307+ if !css.is_empty() {
2308+ container.push((bp_name.to_string(), css));
2312+ let dark = attrs_to_css(attrs, "dark:", kind, parent_kind);
2313+ let print = attrs_to_css(attrs, "print:", kind, parent_kind);
2314+ let motion_safe = attrs_to_css(attrs, "motion-safe:", kind, parent_kind);
2315+ let motion_reduce = attrs_to_css(attrs, "motion-reduce:", kind, parent_kind);
2316+ let landscape = attrs_to_css(attrs, "landscape:", kind, parent_kind);
2317+ let portrait = attrs_to_css(attrs, "portrait:", kind, parent_kind);
2319+ // Dedupe: if a property is declared twice within a single rule, keep only
2320+ // the last occurrence (element-kind defaults are written before
2321+ // user attributes, so a user [list-style disc] correctly overrides the
2322+ // default list-style:none, and we don't need to ship both).
2323+ let base = dedupe_declarations(&base);
2324+ let pseudo: Vec<(String, String)> = pseudo
2326+ .map(|(sel, css)| (sel, dedupe_declarations(&css)))
2328+ let responsive: Vec<(String, String)> = responsive
2330+ .map(|(bp, css)| (bp, dedupe_declarations(&css)))
2332+ let dark = dedupe_declarations(&dark);
2333+ let print = dedupe_declarations(&print);
2334+ let motion_safe = dedupe_declarations(&motion_safe);
2335+ let motion_reduce = dedupe_declarations(&motion_reduce);
2336+ let landscape = dedupe_declarations(&landscape);
2337+ let portrait = dedupe_declarations(&portrait);
2338+ let container: Vec<(String, String)> = container
2340+ .map(|(bp, css)| (bp, dedupe_declarations(&css)))
1623/// Dedupe CSS declarations within a single rule body: for any property
2357/// Dedupe CSS declarations within a single rule body: for any property
1624/// declared more than once, keep only the last occurrence. Unparseable
2358/// declared more than once, keep only the last occurrence. Unparseable
1625−/// segments (no `:`) are preserved as-is. Semicolons inside parentheses or
2359+/// segments (no `:`) are preserved as-is. Semicolons inside parentheses are
1626−/// quoted strings are treated as part of a value, not as declaration
2360+/// treated as part of a value, not as declaration separators.
1628fn dedupe_declarations(css: &str) -> String {
2361fn dedupe_declarations(css: &str) -> String {
1629 if css.is_empty() {
2362 if css.is_empty() {
1630 return String::new();
2363 return String::new();
@@ -1639,26 +2372,8 @@ fn dedupe_declarations(css: &str) -> String {
1639 let mut decls: Vec<(Option<String>, String)> = Vec::new();
2372 let mut decls: Vec<(Option<String>, String)> = Vec::new();
1640 let mut current = String::new();
2373 let mut current = String::new();
1641 let mut depth: i32 = 0;
2374 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() {
2375 for ch in css.chars() {
1647− if escaped {
2376+ if ch == '(' {
1650− } else if ch == '\\' {
1653− } else if let Some(q) = quote {
1658− } else if ch == '"' || ch == '\'' {
1661− } else if ch == '(' {
1662 depth += 1;
2377 depth += 1;
1663 current.push(ch);
2378 current.push(ch);
1664 } else if ch == ')' {
2379 } else if ch == ')' {
@@ -1700,639 +2415,1702 @@ fn dedupe_declarations(css: &str) -> String {
1703− let mut out = String::with_capacity(css.len());
2418+ let mut out = String::with_capacity(css.len());
1704− for (i, (prop, raw)) in decls.iter().enumerate() {
2419+ for (i, (prop, raw)) in decls.iter().enumerate() {
1705− let keep = match prop {
2420+ let keep = match prop {
1706− Some(p) => last.get(p) == Some(&i),
2421+ Some(p) => last.get(p) == Some(&i),
1707− None => true,
2422+ None => true,
1709− if keep {
2424+ if keep {
1710− out.push_str(raw);
2425+ out.push_str(raw);
2431+fn emit_class_attr(out: &mut String, gen_class: Option<&str>, user_class: Option<&str>) {
2432+ match (gen_class, user_class) {
2433+ (Some(g), Some(u)) => {
2434+ out.push_str(" class=\"");
2437+ out.push_str(&html_escape(u));
2440+ (Some(g), None) => {
2441+ out.push_str(" class=\"");
2445+ (None, Some(u)) => {
2446+ out.push_str(" class=\"");
2447+ out.push_str(&html_escape(u));
2454+// ---------------------------------------------------------------------------
2455+// Attribute → CSS mapping
2456+// ---------------------------------------------------------------------------
2458+/// (htmlang prefix, CSS selector suffix)
2459+const PSEUDO_PREFIXES: &[(&str, &str)] = &[
2460+ ("hover:", ":hover"),
2461+ ("active:", ":active"),
2462+ ("focus:", ":focus"),
2463+ ("focus-visible:", ":focus-visible"),
2464+ ("focus-within:", ":focus-within"),
2465+ ("disabled:", ":disabled"),
2466+ ("checked:", ":checked"),
2467+ ("placeholder:", "::placeholder"),
2468+ ("first:", ":first-child"),
2469+ ("last:", ":last-child"),
2470+ ("odd:", ":nth-child(odd)"),
2471+ ("even:", ":nth-child(even)"),
2472+ ("before:", "::before"),
2473+ ("after:", "::after"),
2474+ ("selection:", "::selection"),
2475+ ("visited:", ":visited"),
2476+ ("empty:", ":empty"),
2477+ ("target:", ":target"),
2478+ ("valid:", ":valid"),
2479+ ("invalid:", ":invalid"),
2481+const RESPONSIVE_PREFIXES: &[&str] = &["sm:", "md:", "lg:", "xl:", "2xl:"];
2482+const MEDIA_PREFIXES: &[&str] = &[
2490+const CONTAINER_QUERY_PREFIXES: &[&str] = &["cq-sm:", "cq-md:", "cq-lg:", "cq-xl:", "cq-2xl:"];
2492+fn is_prefixed_attr(key: &str) -> bool {
2493+ PSEUDO_PREFIXES.iter().any(|&(p, _)| key.starts_with(p))
2494+ || RESPONSIVE_PREFIXES.iter().any(|p| key.starts_with(p))
2495+ || MEDIA_PREFIXES.iter().any(|p| key.starts_with(p))
2496+ || CONTAINER_QUERY_PREFIXES.iter().any(|p| key.starts_with(p))
2497+ || key.starts_with("nth:")
2498+ || key.starts_with("has(")
2501+/// `display:flex;flex-direction:column;` — base layout for `@el` and every
2502+/// semantic wrapper that behaves like a column.
2503+const FLEX_COLUMN: &str = "display:flex;flex-direction:column;";
2505+/// Font stack shared by `@pre`, `@code`, `@kbd`.
2506+const MONOSPACE_STACK: &str = "font-family:ui-monospace,monospace;";
2508+/// Declarations common to `@badge` and `@tag`. They differ only in
2509+/// `border-radius` (and `@badge` additionally centers content / pins
2510+/// line-height:1), so keeping the shared base here avoids drift.
2511+const PILL_BASE: &str =
2512+ "display:inline-flex;align-items:center;padding:2px 8px;font-size:0.75rem;font-weight:600;";
2515+ attrs: &[Attribute],
2516+ state_prefix: &str,
2517+ kind: &ElementKind,
2518+ parent_kind: Option<&ElementKind>,
2520+ let mut css = String::new();
2522+ // Base element styles only for the default (non-state) pass
2523+ if state_prefix.is_empty() {
2525+ ElementKind::Row => css.push_str("display:flex;flex-direction:row;"),
2526+ ElementKind::Column
2528+ // Semantic elements get flex column layout like @el
2530+ | ElementKind::Header
2531+ | ElementKind::Footer
2532+ | ElementKind::Main
2533+ | ElementKind::Section
2534+ | ElementKind::Article
2535+ | ElementKind::Aside
2536+ | ElementKind::ListItem
2537+ | ElementKind::Form
2538+ | ElementKind::Details
2539+ | ElementKind::Dialog => css.push_str(FLEX_COLUMN),
2540+ ElementKind::Paragraph => css.push_str("margin:0;"),
2541+ // Lists: reset browser defaults
2542+ ElementKind::List => css.push_str("margin:0;padding-left:0;list-style:none;"),
2543+ // Figure / Blockquote: flex column with browser margin reset
2544+ ElementKind::Figure | ElementKind::Blockquote => {
2545+ css.push_str(FLEX_COLUMN);
2546+ css.push_str("margin:0;");
2548+ // Pre: preserve whitespace
2549+ ElementKind::Pre => {
2550+ css.push_str("margin:0;white-space:pre;");
2551+ css.push_str(MONOSPACE_STACK);
2553+ // Code / Kbd: monospace font
2554+ ElementKind::Code | ElementKind::Kbd => css.push_str(MONOSPACE_STACK),
2555+ ElementKind::DefinitionList => css.push_str("margin:0;"),
2556+ ElementKind::DefinitionDescription => {
2557+ css.push_str("margin:0;");
2558+ css.push_str(FLEX_COLUMN);
2560+ ElementKind::Fieldset => {
2561+ css.push_str(FLEX_COLUMN);
2562+ // Align padding to the px-based scale used by Badge/Tag/Chip
2563+ // rather than the old 0.5em (which depended on font-size).
2564+ css.push_str("border:1px solid currentColor;padding:8px;margin:0;");
2566+ ElementKind::Grid => css.push_str("display:grid;"),
2567+ ElementKind::Stack => css.push_str("position:relative;"),
2568+ ElementKind::Badge => {
2569+ css.push_str(PILL_BASE);
2570+ css.push_str("justify-content:center;border-radius:9999px;line-height:1;");
2572+ ElementKind::Tag => {
2573+ css.push_str(PILL_BASE);
2574+ css.push_str("border-radius:4px;");
2576+ ElementKind::Tooltip => css.push_str("position:relative;cursor:help;"),
2577+ ElementKind::Spacer => css.push_str("flex:1;"),
2578+ ElementKind::Avatar => css.push_str("display:inline-flex;align-items:center;justify-content:center;border-radius:9999px;overflow:hidden;flex-shrink:0;"),
2579+ 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;"),
2580+ 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;"),
2583+ // Children of @carousel get scroll-snap-align and flex-shrink
2584+ if matches!(parent_kind, Some(ElementKind::Carousel)) {
2585+ css.push_str("scroll-snap-align:start;flex-shrink:0;");
2589+ for attr in attrs {
2590+ // Determine the effective key for this pass
2591+ let effective_key = if state_prefix.is_empty() {
2592+ if is_prefixed_attr(&attr.key) {
2597+ match attr.key.strip_prefix(state_prefix) {
2603+ let val = attr.value.as_deref();
2605+ match effective_key {
2607+ "spacing" | "gap" => {
2608+ if let Some(v) = val {
2609+ push_css(&mut css, "gap", &css_px(v));
2613+ if let Some(v) = val {
2614+ push_css(&mut css, "padding", &css_px_multi(v));
2618+ if let Some(v) = val {
2619+ // Logical property covers both inline sides in one
2620+ // declaration; for symmetric values this is visually
2621+ // identical to padding-left/right in LTR and RTL.
2622+ push_css(&mut css, "padding-inline", &css_px(v));
2626+ if let Some(v) = val {
2627+ push_css(&mut css, "padding-block", &css_px(v));
2633+ if let Some(v) = val {
2635+ "fill" => match parent_kind {
2636+ Some(ElementKind::Row) => {
2637+ push_css(&mut css, "flex", "1");
2638+ push_css(&mut css, "min-width", "0");
2640+ _ => push_css(&mut css, "width", "100%"),
2642+ "shrink" => push_css(&mut css, "flex-shrink", "0"),
2643+ _ => push_css(&mut css, "width", &css_px(v)),
2648+ if let Some(v) = val {
2650+ "fill" => match parent_kind {
2651+ Some(ElementKind::Column) => {
2652+ push_css(&mut css, "flex", "1");
2653+ push_css(&mut css, "min-height", "0");
2655+ _ => push_css(&mut css, "height", "100%"),
2657+ "shrink" => push_css(&mut css, "flex-shrink", "0"),
2658+ _ => push_css(&mut css, "height", &css_px(v)),
2663+ if let Some(v) = val {
2664+ push_css(&mut css, "min-width", &css_px(v));
2668+ if let Some(v) = val {
2669+ push_css(&mut css, "max-width", &css_px(v));
2673+ if let Some(v) = val {
2674+ push_css(&mut css, "min-height", &css_px(v));
2678+ if let Some(v) = val {
2679+ push_css(&mut css, "max-height", &css_px(v));
2684+ "center-x" => match parent_kind {
2685+ Some(ElementKind::Column) | Some(ElementKind::El) => {
2686+ push_css(&mut css, "align-self", "center");
2689+ push_css(&mut css, "margin-left", "auto");
2690+ push_css(&mut css, "margin-right", "auto");
2693+ "center-y" => match parent_kind {
2694+ Some(ElementKind::Row) => push_css(&mut css, "align-self", "center"),
2696+ push_css(&mut css, "margin-top", "auto");
2697+ push_css(&mut css, "margin-bottom", "auto");
2700+ "align-left" => match parent_kind {
2701+ Some(ElementKind::Column) | Some(ElementKind::El) => {
2702+ push_css(&mut css, "align-self", "flex-start");
2704+ _ => push_css(&mut css, "margin-right", "auto"),
2706+ "align-right" => match parent_kind {
2707+ Some(ElementKind::Column) | Some(ElementKind::El) => {
2708+ push_css(&mut css, "align-self", "flex-end");
2710+ _ => push_css(&mut css, "margin-left", "auto"),
2712+ "align-top" => match parent_kind {
2713+ Some(ElementKind::Row) => push_css(&mut css, "align-self", "flex-start"),
2714+ _ => push_css(&mut css, "margin-bottom", "auto"),
2716+ "align-bottom" => match parent_kind {
2717+ Some(ElementKind::Row) => push_css(&mut css, "align-self", "flex-end"),
2718+ _ => push_css(&mut css, "margin-top", "auto"),
2723+ if let Some(v) = val {
2724+ push_css(&mut css, "background", v);
2728+ if let Some(v) = val {
2729+ push_css(&mut css, "color", v);
2733+ if let Some(v) = val {
2734+ let parts: Vec<&str> = v.splitn(2, ' ').collect();
2735+ if parts.len() == 2 {
2739+ &format!("{} solid {}", css_px(parts[0]), parts[1]),
2745+ &format!("{} solid currentColor", css_px(parts[0])),
2750+ "border-top" | "border-bottom" | "border-left" | "border-right" => {
2751+ if let Some(v) = val {
2752+ let parts: Vec<&str> = v.splitn(2, ' ').collect();
2753+ if parts.len() == 2 {
2757+ &format!("{} solid {}", css_px(parts[0]), parts[1]),
2763+ &format!("{} solid currentColor", css_px(parts[0])),
2769+ if let Some(v) = val {
2770+ push_css(&mut css, "border-radius", &css_px(v));
2773+ "bold" => push_css(&mut css, "font-weight", "bold"),
2774+ "italic" => push_css(&mut css, "font-style", "italic"),
2775+ "underline" => push_css(&mut css, "text-decoration", "underline"),
2777+ if let Some(v) = val {
2778+ push_css(&mut css, "font-size", &css_px(v));
2782+ if let Some(v) = val {
2783+ push_css(&mut css, "font-family", v);
2787+ if let Some(v) = val {
2788+ push_css(&mut css, "transition", v);
2792+ if let Some(v) = val {
2793+ push_css(&mut css, "cursor", v);
2797+ if let Some(v) = val {
2798+ push_css(&mut css, "opacity", v);
2804+ if let Some(v) = val {
2805+ push_css(&mut css, "text-align", v);
2809+ if let Some(v) = val {
2810+ push_css(&mut css, "line-height", &css_line_height(v));
2813+ "letter-spacing" => {
2814+ if let Some(v) = val {
2815+ push_css(&mut css, "letter-spacing", &css_px(v));
2818+ "text-transform" => {
2819+ if let Some(v) = val {
2820+ push_css(&mut css, "text-transform", v);
2824+ if let Some(v) = val {
2825+ push_css(&mut css, "white-space", v);
2829+ // Overflow & positioning
2831+ if let Some(v) = val {
2832+ push_css(&mut css, "overflow", v);
2836+ if let Some(v) = val {
2837+ push_css(&mut css, "position", v);
2841+ if let Some(v) = val {
2842+ push_css(&mut css, "top", &css_px(v));
2846+ if let Some(v) = val {
2847+ push_css(&mut css, "right", &css_px(v));
2851+ if let Some(v) = val {
2852+ push_css(&mut css, "bottom", &css_px(v));
2856+ if let Some(v) = val {
2857+ push_css(&mut css, "left", &css_px(v));
2861+ if let Some(v) = val {
2862+ push_css(&mut css, "z-index", v);
2866+ // Display & visibility
2868+ if let Some(v) = val {
2869+ push_css(&mut css, "display", v);
2873+ if let Some(v) = val {
2874+ push_css(&mut css, "visibility", v);
2877+ "hidden" => push_css(&mut css, "display", "none"),
2879+ // Transform & filters
2881+ if let Some(v) = val {
2882+ push_css(&mut css, "transform", v);
2885+ "backdrop-filter" => {
2886+ if let Some(v) = val {
2887+ push_css(&mut css, "backdrop-filter", v);
2893+ if let Some(v) = val {
2894+ push_css(&mut css, "box-shadow", v);
2899+ "wrap" => push_css(&mut css, "flex-wrap", "wrap"),
2901+ if let Some(v) = val {
2902+ push_css(&mut css, "column-gap", &css_px(v));
2906+ if let Some(v) = val {
2907+ push_css(&mut css, "row-gap", &css_px(v));
2913+ push_css(&mut css, "display", "grid");
2916+ if let Some(v) = val {
2917+ if let Ok(n) = v.parse::<u32>() {
2920+ "grid-template-columns",
2921+ &format!("repeat({},1fr)", n),
2924+ push_css(&mut css, "grid-template-columns", v);
2929+ if let Some(v) = val {
2930+ if let Ok(n) = v.parse::<u32>() {
2933+ "grid-template-rows",
2934+ &format!("repeat({},1fr)", n),
2937+ push_css(&mut css, "grid-template-rows", v);
2942+ if let Some(v) = val {
2943+ push_css(&mut css, "grid-column", &format!("span {}", v));
2947+ if let Some(v) = val {
2948+ push_css(&mut css, "grid-row", &format!("span {}", v));
2954+ if let Some(v) = val {
2955+ push_css(&mut css, "animation", v);
2960+ "aspect-ratio" => {
2961+ if let Some(v) = val {
2962+ push_css(&mut css, "aspect-ratio", v);
2966+ // CSS containment for rendering performance
2968+ if let Some(v) = val {
2969+ push_css(&mut css, "contain", v);
2971+ push_css(&mut css, "contain", "layout style paint");
2974+ "content-visibility" => {
2975+ if let Some(v) = val {
2976+ push_css(&mut css, "content-visibility", v);
2978+ push_css(&mut css, "content-visibility", "auto");
2982+ // Outline (like border but doesn't affect layout)
2984+ if let Some(v) = val {
2985+ let parts: Vec<&str> = v.splitn(2, ' ').collect();
2986+ if parts.len() == 2 {
2990+ &format!("{} solid {}", css_px(parts[0]), parts[1]),
2996+ &format!("{} solid currentColor", css_px(parts[0])),
3002+ // Logical properties (i18n-aware)
3003+ "padding-inline" => {
3004+ if let Some(v) = val {
3005+ push_css(&mut css, "padding-inline", &css_px_multi(v));
3008+ "padding-block" => {
3009+ if let Some(v) = val {
3010+ push_css(&mut css, "padding-block", &css_px_multi(v));
3013+ "margin-inline" => {
3014+ if let Some(v) = val {
3015+ push_css(&mut css, "margin-inline", &css_px_multi(v));
3018+ "margin-block" => {
3019+ if let Some(v) = val {
3020+ push_css(&mut css, "margin-block", &css_px_multi(v));
3024+ // Logical property start/end variants
3025+ "padding-inline-start"
3026+ | "padding-inline-end"
3027+ | "padding-block-start"
3028+ | "padding-block-end"
3029+ | "margin-inline-start"
3030+ | "margin-inline-end"
3031+ | "margin-block-start"
3032+ | "margin-block-end" => {
3033+ if let Some(v) = val {
3034+ push_css(&mut css, effective_key, &css_px(v));
3039+ "inset-inline" | "inset-block" => {
3040+ if let Some(v) = val {
3041+ push_css(&mut css, effective_key, &css_px_multi(v));
3044+ "inset-inline-start" | "inset-inline-end" | "inset-block-start" | "inset-block-end" => {
3045+ if let Some(v) = val {
3046+ push_css(&mut css, effective_key, &css_px(v));
3053+ | "border-inline-start"
3054+ | "border-inline-end"
3055+ | "border-block-start"
3056+ | "border-block-end" => {
3057+ if let Some(v) = val {
3058+ push_css(&mut css, effective_key, v);
3062+ // Logical border-radius
3063+ "border-start-start-radius"
3064+ | "border-start-end-radius"
3065+ | "border-end-start-radius"
3066+ | "border-end-end-radius" => {
3067+ if let Some(v) = val {
3068+ push_css(&mut css, effective_key, &css_px(v));
3072+ // Logical scroll margins & padding
3073+ "scroll-margin-inline"
3074+ | "scroll-margin-block"
3075+ | "scroll-padding-inline"
3076+ | "scroll-padding-block" => {
3077+ if let Some(v) = val {
3078+ push_css(&mut css, effective_key, &css_px_multi(v));
3083+ "inline-size" | "block-size" | "min-inline-size" | "max-inline-size"
3084+ | "min-block-size" | "max-block-size" => {
3085+ if let Some(v) = val {
3086+ push_css(&mut css, effective_key, &css_px(v));
3091+ "scroll-snap-type" => {
3092+ if let Some(v) = val {
3093+ push_css(&mut css, "scroll-snap-type", v);
3096+ "scroll-snap-align" => {
3097+ if let Some(v) = val {
3098+ push_css(&mut css, "scroll-snap-align", v);
3104+ if let Some(v) = val {
3105+ push_css(&mut css, "margin", &css_px_multi(v));
3109+ if let Some(v) = val {
3110+ push_css(&mut css, "margin-inline", &css_px(v));
3114+ if let Some(v) = val {
3115+ push_css(&mut css, "margin-block", &css_px(v));
3121+ if let Some(v) = val {
3122+ push_css(&mut css, "filter", v);
3126+ // Object fit/position (for images)
3128+ if let Some(v) = val {
3129+ push_css(&mut css, "object-fit", v);
3132+ "object-position" => {
3133+ if let Some(v) = val {
3134+ push_css(&mut css, "object-position", v);
3140+ if let Some(v) = val {
3141+ push_css(&mut css, "text-shadow", v);
3146+ "text-overflow" => {
3147+ if let Some(v) = val {
3148+ push_css(&mut css, "text-overflow", v);
3153+ "pointer-events" => {
3154+ if let Some(v) = val {
3155+ push_css(&mut css, "pointer-events", v);
3159+ if let Some(v) = val {
3160+ push_css(&mut css, "user-select", v);
3164+ // Flexbox/grid alignment
3165+ "justify-content" => {
3166+ if let Some(v) = val {
3167+ push_css(&mut css, "justify-content", v);
3171+ if let Some(v) = val {
3172+ push_css(&mut css, "align-items", v);
3178+ if let Some(v) = val {
3179+ push_css(&mut css, "order", v);
3183+ // Background extras
3184+ "background-size" => {
3185+ if let Some(v) = val {
3186+ push_css(&mut css, "background-size", v);
3189+ "background-position" => {
3190+ if let Some(v) = val {
3191+ push_css(&mut css, "background-position", v);
3194+ "background-repeat" => {
3195+ if let Some(v) = val {
3196+ push_css(&mut css, "background-repeat", v);
3202+ if let Some(v) = val {
3203+ push_css(&mut css, "word-break", v);
3206+ "overflow-wrap" => {
3207+ if let Some(v) = val {
3208+ push_css(&mut css, "overflow-wrap", v);
3212+ // Container queries
3214+ push_css(&mut css, "container-type", "inline-size");
3216+ "container-name" => {
3217+ if let Some(v) = val {
3218+ push_css(&mut css, "container-name", v);
3221+ "container-type" => {
3222+ if let Some(v) = val {
3223+ push_css(&mut css, "container-type", v);
3229+ if let Some(v) = val {
3230+ push_css(&mut css, "overflow-x", v);
3234+ if let Some(v) = val {
3235+ push_css(&mut css, "overflow-y", v);
3239+ // Inset (shorthand for top/right/bottom/left)
3241+ if let Some(v) = val {
3242+ push_css(&mut css, "inset", &css_px(v));
3246+ // Accent & caret colors
3247+ "accent-color" => {
3248+ if let Some(v) = val {
3249+ push_css(&mut css, "accent-color", v);
3253+ if let Some(v) = val {
3254+ push_css(&mut css, "caret-color", v);
3258+ // Color scheme & appearance
3259+ "color-scheme" => {
3260+ if let Some(v) = val {
3261+ push_css(&mut css, "color-scheme", v);
3265+ if let Some(v) = val {
3266+ push_css(&mut css, "appearance", v);
3272+ if let Some(v) = val {
3273+ push_css(&mut css, "list-style", v);
3278+ "border-collapse" => {
3279+ if let Some(v) = val {
3280+ push_css(&mut css, "border-collapse", v);
3283+ "border-spacing" => {
3284+ if let Some(v) = val {
3285+ push_css(&mut css, "border-spacing", &css_px(v));
3290+ "text-decoration" => {
3291+ if let Some(v) = val {
3292+ push_css(&mut css, "text-decoration", v);
3295+ "text-decoration-color" => {
3296+ if let Some(v) = val {
3297+ push_css(&mut css, "text-decoration-color", v);
3300+ "text-decoration-thickness" => {
3301+ if let Some(v) = val {
3302+ push_css(&mut css, "text-decoration-thickness", &css_px(v));
3305+ "text-decoration-style" => {
3306+ if let Some(v) = val {
3307+ push_css(&mut css, "text-decoration-style", v);
3310+ "text-underline-offset" => {
3311+ if let Some(v) = val {
3312+ push_css(&mut css, "text-underline-offset", &css_px(v));
3317+ "column-width" => {
3318+ if let Some(v) = val {
3319+ push_css(&mut css, "column-width", &css_px(v));
3323+ if let Some(v) = val {
3324+ push_css(&mut css, "column-rule", v);
3328+ // Place items/self
3330+ if let Some(v) = val {
3331+ push_css(&mut css, "place-items", v);
3335+ if let Some(v) = val {
3336+ push_css(&mut css, "place-self", v);
3341+ "scroll-behavior" => {
3342+ if let Some(v) = val {
3343+ push_css(&mut css, "scroll-behavior", v);
3349+ if let Some(v) = val {
3350+ push_css(&mut css, "resize", v);
3354+ // New CSS properties
3356+ if let Some(v) = val {
3357+ push_css(&mut css, "clip-path", v);
3360+ "mix-blend-mode" => {
3361+ if let Some(v) = val {
3362+ push_css(&mut css, "mix-blend-mode", v);
3365+ "background-blend-mode" => {
3366+ if let Some(v) = val {
3367+ push_css(&mut css, "background-blend-mode", v);
3370+ "writing-mode" => {
3371+ if let Some(v) = val {
3372+ push_css(&mut css, "writing-mode", v);
3375+ "column-count" => {
3376+ if let Some(v) = val {
3377+ push_css(&mut css, "column-count", v);
3381+ if let Some(v) = val {
3382+ push_css(&mut css, "column-gap", &css_px(v));
3386+ if let Some(v) = val {
3387+ push_css(&mut css, "text-indent", &css_px(v));
3391+ if let Some(v) = val {
3392+ push_css(&mut css, "hyphens", v);
3396+ if let Some(v) = val {
3397+ push_css(&mut css, "flex-grow", v);
3401+ if let Some(v) = val {
3402+ push_css(&mut css, "flex-shrink", v);
3406+ if let Some(v) = val {
3407+ push_css(&mut css, "flex-basis", &css_px(v));
3411+ if let Some(v) = val {
3412+ push_css(&mut css, "isolation", v);
3415+ "place-content" => {
3416+ if let Some(v) = val {
3417+ push_css(&mut css, "place-content", v);
3420+ "background-image" => {
3421+ if let Some(v) = val {
3422+ push_css(&mut css, "background-image", v);
3426+ if let Some(v) = val {
3427+ push_css(&mut css, "font-weight", v);
3431+ if let Some(v) = val {
3432+ push_css(&mut css, "font-style", v);
3436+ if let Some(v) = val {
3437+ push_css(&mut css, "text-wrap", v);
3441+ if let Some(v) = val {
3442+ push_css(&mut css, "will-change", v);
3445+ "touch-action" => {
3446+ if let Some(v) = val {
3447+ push_css(&mut css, "touch-action", v);
3450+ "vertical-align" => {
3451+ if let Some(v) = val {
3452+ push_css(&mut css, "vertical-align", v);
3455+ "scroll-margin" => {
3456+ if let Some(v) = val {
3457+ push_css(&mut css, "scroll-margin", &css_px(v));
3460+ "scroll-margin-top"
3461+ | "scroll-margin-bottom"
3462+ | "scroll-margin-left"
3463+ | "scroll-margin-right" => {
3464+ if let Some(v) = val {
3465+ push_css(&mut css, effective_key, &css_px(v));
3468+ "scroll-padding" => {
3469+ if let Some(v) = val {
3470+ push_css(&mut css, "scroll-padding", &css_px(v));
3473+ "scroll-padding-top"
3474+ | "scroll-padding-bottom"
3475+ | "scroll-padding-left"
3476+ | "scroll-padding-right" => {
3477+ if let Some(v) = val {
3478+ push_css(&mut css, effective_key, &css_px(v));
3482+ if let Some(v) = val {
3483+ push_css(&mut css, "direction", v);
3488+ if let Some(v) = val {
3489+ // Wrap in quotes if not already quoted and not a CSS keyword
3490+ if v.starts_with('"')
3491+ || v.starts_with('\'')
3494+ || v.starts_with("attr(")
3495+ || v.starts_with("counter(")
3497+ push_css(&mut css, "content", v);
3499+ push_css(&mut css, "content", &format!("\"{}\"", v));
3504+ // --- CSS Shorthands ---
3506+ push_css(&mut css, "overflow", "hidden");
3507+ push_css(&mut css, "text-overflow", "ellipsis");
3508+ push_css(&mut css, "white-space", "nowrap");
3511+ if let Some(v) = val {
3512+ push_css(&mut css, "display", "-webkit-box");
3513+ push_css(&mut css, "-webkit-line-clamp", v);
3514+ push_css(&mut css, "-webkit-box-orient", "vertical");
3515+ push_css(&mut css, "overflow", "hidden");
3519+ if let Some(v) = val {
3520+ push_css(&mut css, "filter", &format!("blur({})", css_px(v)));
3523+ "backdrop-blur" => {
3524+ if let Some(v) = val {
3525+ push_css(&mut css, "backdrop-filter", &format!("blur({})", css_px(v)));
3528+ "no-scrollbar" => {
3529+ push_css(&mut css, "scrollbar-width", "none");
3530+ push_css(&mut css, "-ms-overflow-style", "none");
3536+ "linear-gradient(90deg,#e5e7eb 25%,#f3f4f6 50%,#e5e7eb 75%)",
3538+ push_css(&mut css, "background-size", "200% 100%");
3542+ "hl-skeleton 1.5s ease-in-out infinite",
3546+ if let Some(v) = val {
3547+ // Parse: "from to [angle]" or "color1 color2 [angle]"
3548+ let parts: Vec<&str> = v.split_whitespace().collect();
3549+ let bg = if parts.len() >= 3
3550+ && (parts[2].ends_with("deg")
3551+ || parts[2].ends_with("turn")
3552+ || parts[2].ends_with("rad"))
3554+ format!("linear-gradient({},{},{})", parts[2], parts[0], parts[1])
3555+ } else if parts.len() >= 2 {
3556+ format!("linear-gradient({},{})", parts[0], parts[1])
3558+ format!("linear-gradient({},transparent)", parts[0])
3560+ push_css(&mut css, "background", &bg);
3565+ "grid-template-areas" => {
3566+ if let Some(v) = val {
3567+ push_css(&mut css, "grid-template-areas", v);
3571+ if let Some(v) = val {
3572+ push_css(&mut css, "grid-area", v);
3576+ // View transitions
3577+ "view-transition-name" => {
3578+ if let Some(v) = val {
3579+ push_css(&mut css, "view-transition-name", v);
3583+ // Animate shorthand (alias for animation)
3585+ if let Some(v) = val {
3586+ push_css(&mut css, "animation", v);
3591+ "grid-template-columns" => {
3592+ if let Some(v) = val {
3593+ push_css(&mut css, "grid-template-columns", v);
3596+ "grid-template-rows" => {
3597+ if let Some(v) = val {
3598+ push_css(&mut css, "grid-template-rows", v);
3602+ // Scroll-driven animations
3603+ "animation-timeline" => {
3604+ if let Some(v) = val {
3605+ push_css(&mut css, "animation-timeline", v);
3608+ "animation-range" => {
3609+ if let Some(v) = val {
3610+ push_css(&mut css, "animation-range", v);
3613+ "view-timeline-name" => {
3614+ if let Some(v) = val {
3615+ push_css(&mut css, "view-timeline-name", v);
3618+ "view-timeline-axis" => {
3619+ if let Some(v) = val {
3620+ push_css(&mut css, "view-timeline-axis", v);
3623+ "scroll-timeline-name" => {
3624+ if let Some(v) = val {
3625+ push_css(&mut css, "scroll-timeline-name", v);
3628+ "scroll-timeline-axis" => {
3629+ if let Some(v) = val {
3630+ push_css(&mut css, "scroll-timeline-axis", v);
3634+ // Anchor positioning
3636+ if let Some(v) = val {
3637+ push_css(&mut css, "anchor-name", v);
3640+ "position-anchor" => {
3641+ if let Some(v) = val {
3642+ push_css(&mut css, "position-anchor", v);
3645+ "position-area" => {
3646+ if let Some(v) = val {
3647+ push_css(&mut css, "position-area", v);
3651+ // Legacy alias for position-area
3652+ if let Some(v) = val {
3653+ push_css(&mut css, "position-area", v);
3657+ // initial-letter (drop caps)
3658+ "initial-letter" => {
3659+ if let Some(v) = val {
3660+ push_css(&mut css, "initial-letter", v);
3664+ // Critical CSS hint — not CSS, handled elsewhere
3667+ // Identity and HTML passthrough — not CSS
3668+ "id" | "class" => {}
3669+ "type" | "placeholder" | "name" | "value" | "disabled" | "required" | "checked"
3670+ | "for" | "action" | "method" | "autocomplete" | "min" | "max" | "step" | "pattern"
3671+ | "maxlength" | "rows" | "cols" | "multiple" | "alt" | "role" | "tabindex"
3672+ | "title" | "controls" | "autoplay" | "loop" | "muted" | "playsinline" | "poster" | "preload"
3673+ | "loading" | "decoding" | "ordered" | "src" | "open" | "novalidate" | "low"
3674+ | "high" | "optimum" | "colspan" | "rowspan" | "scope" | "inline" | "responsive"
3675+ | "datetime" | "media" | "sizes" | "srcset" | "cite" | "list" | "sandbox" | "allow"
3676+ | "allowfullscreen" | "referrerpolicy" | "formaction" | "formmethod" | "formtarget"
3677+ | "target" | "autofocus" => {}
1716−fn emit_class_attr(out: &mut String, gen_class: Option<&str>, user_class: Option<&str>) {
3679+ _ => {}
1717− match (gen_class, user_class) {
1718− (Some(g), Some(u)) => {
1719− out.push_str(" class=\"");
1722− out.push_str(&html_escape(u));
1725− (Some(g), None) => {
1726− out.push_str(" class=\"");
1730− (None, Some(u)) => {
1731− out.push_str(" class=\"");
1732− out.push_str(&html_escape(u));
1739−// ---------------------------------------------------------------------------
1740−// Attribute → CSS mapping
1741−// ---------------------------------------------------------------------------
1743−/// Where an element is written, which its CSS depends on.
3683+ css
1745− kind: &'a ElementKind,
1746− /// How its parent lays out its children: its `width fill`, `height
1747− /// fill` and `shrink` compile against it.
1749− /// It has `@in-front` / `@behind` children.
1750− has_overlay_children: bool,
1751− /// A row, column or grid inside text, laid out inline.
1753− /// The page's `<body>`, which the reset already makes a column.
1757−impl Site<'_> {
3686+fn push_css(css: &mut String, prop: &str, value: &str) {
1758− /// Where an element in a parent with the layout `layout` and the flow
3687+ css.push_str(prop);
1759− /// `parent` is.
3688+ css.push(':');
1760− fn new<'a>(elem: &'a Element, layout: Option<Layout>, parent: &'a Flow) -> Site<'a> {
3689+ css.push_str(value);
1761− Site {
3690+ css.push(';');
1764− has_overlay_children: has_overlay_children(elem),
1765− inline: layout == Some(Layout::Text) && elem.kind.layout().is_container(),
1771−// ---------------------------------------------------------------------------
3693+/// Known CSS units — if a value ends with one, skip appending `px`.
1772−// Direction: what a child's `fill` and `shrink` compile against
3694+const CSS_UNITS: &[&str] = &[
1773−// ---------------------------------------------------------------------------
3695+ "%", "rem", "em", "vh", "vw", "vmin", "vmax", "dvh", "svh", "lvh", "ch", "ex", "cm", "mm",
3696+ "in", "pt", "pc", "fr",
1775−/// The way a flex row or column lays out its children.
3699+/// Format a numeric value: if it already has a CSS unit, pass through as-is;
1776−#[derive(Clone, Copy, PartialEq, Eq, Debug)]
3700+/// otherwise append `px`.
1777−enum Axis {
3701+fn css_px(value: &str) -> String {
1778− Row,
3702+ let v = value.trim();
1779− Column,
3703+ if v == "0" {
3704+ return "0".to_string();
3706+ if CSS_UNITS.iter().any(|u| v.ends_with(u)) {
3707+ return v.to_string();
3709+ if v.starts_with("var(")
3710+ || v.starts_with("calc(")
3711+ || v.starts_with("clamp(")
3712+ || v.starts_with("min(")
3713+ || v.starts_with("max(")
3715+ return v.to_string();
1782−impl Axis {
3720+/// Rewrite literal values that match a declared CSS custom property (from
1783− /// The direction a `flex-direction` or `flex-flow` value sets, if it
3721+/// `@theme` or `@let --name value`) to `var(--name)` references. Matches are
1784− /// names one (not `var(--dir)`, which only the browser knows).
3722+/// anchored to CSS value boundaries so e.g. `#3b82f6` inside a longer hex or
1785− fn of_value(value: &str) -> Option<Axis> {
3723+/// inside an identifier is not replaced. The `:root` block is emitted before
1786− value.split_whitespace().find_map(|word| match word {
3724+/// this call runs, so its declarations are not affected.
1787− "row" | "row-reverse" => Some(Axis::Row),
3725+fn substitute_css_vars(css: &str, vars: &[(String, String)]) -> String {
1788− "column" | "column-reverse" => Some(Axis::Column),
3726+ if css.is_empty() || vars.is_empty() {
1789− _ => None,
3727+ return css.to_string();
3729+ // Prefer longer values first so that if two vars share a prefix, the
3730+ // longer (more specific) match wins.
3731+ let mut pairs: Vec<(&str, String)> = vars
3733+ .filter(|(name, value)| name.starts_with("--") && !value.is_empty())
3734+ .map(|(name, value)| (value.as_str(), format!("var({})", name)))
3736+ pairs.sort_by_key(|(v, _)| std::cmp::Reverse(v.len()));
3737+ if pairs.is_empty() {
3738+ return css.to_string();
1794−/// How an element lays out its children, as its CSS sets it: the
3741+ let is_boundary_before = |b: Option<u8>| match b {
1795−/// direction its children's `width`/`height` `fill` and `shrink` compile
3742+ None => true,
1796−/// against. That is the direction of `@row` or of a column, or the one its
3743+ Some(c) => matches!(
1797−/// own `flex-direction` (or `flex-flow`) sets, with or without media or
3744+ c,
1798−/// container prefixes. Like elm-ui's `.r > .wf`, the rules for a direction
3745+ b':' | b' ' | b',' | b'(' | b';' | b'{' | b'\n' | b'\t'
1799−/// set under a prefix are keyed on the element's class: `@media (...) {
3746+ ),
1800−/// :where(.a)>.b {...} }`.
3747+ };
1801−#[derive(Clone, Default)]
3748+ let is_boundary_after = |b: Option<u8>| match b {
1802−struct Flow {
3749+ None => true,
1803− /// Without a prefix; `None` when the element isn't a flex row or column
3750+ Some(c) => matches!(
1804− /// (a grid, text, HTML's own layout, the top of the page)
3751+ c,
1805− base: Option<Axis>,
3752+ b';' | b'}' | b',' | b' ' | b')' | b'\n' | b'\t'
1806− /// The direction under each chain of at-rule prefixes that sets one, in
3753+ ),
1807− /// the order their blocks are written
3754+ };
1808− changes: Vec<(Vec<usize>, Axis)>,
1809− /// The element's generated class, which the rules for the changes are
1811− class: Option<String>,
1814−impl Flow {
3756+ let bytes = css.as_bytes();
1815− fn of(elem: &Element) -> Flow {
3757+ let mut out = String::with_capacity(css.len());
1816− let mut base = match elem.kind.layout() {
3758+ let mut i = 0;
1817− Layout::Row => Axis::Row,
3759+ let mut prev: Option<u8> = None;
1818− Layout::Column => Axis::Column,
3760+ while i < bytes.len() {
1819− _ => return Flow::default(),
3761+ if is_boundary_before(prev) {
1820− };
3762+ let mut matched = false;
1821− let mut changes: Vec<(Vec<usize>, Axis)> = Vec::new();
3763+ for (val, repl) in &pairs {
1822− for attr in elem.attrs.iter().filter(|a| !a.html) {
3764+ let vb = val.as_bytes();
1823− let (condition, name) = Condition::of(&attr.key);
3765+ if i + vb.len() <= bytes.len() && &bytes[i..i + vb.len()] == vb {
1824− if !matches!(name, "flex-direction" | "flex-flow") || !condition.selector.is_empty() {
3766+ let next = bytes.get(i + vb.len()).copied();
1825− continue;
3767+ if is_boundary_after(next) {
3768+ out.push_str(repl);
3769+ prev = repl.as_bytes().last().copied();
1827− let Some(axis) = attr.value.as_deref().and_then(Axis::of_value) else {
3776+ if matched {
1828 continue;
3777 continue;
1830− if condition.at.is_empty() {
1833− // The later one wins, as in the CSS
1834− changes.retain(|(at, _)| *at != condition.at);
1835− changes.push((condition.at, axis));
1838− changes.sort_by_key(|(at, _)| at_order(at));
3780+ // Advance by one UTF-8 code point.
1839− Flow {
3781+ let start = i;
1840− base: Some(base),
3782+ i += 1;
1841− changes,
3783+ while i < bytes.len() && (bytes[i] & 0xC0) == 0x80 {
1842− class: None,
3784+ i += 1;
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);
1856− .find(|(chain, _)| Condition::at_only(chain).holds_at(&here))
1857− .map(|&(_, axis)| axis);
1858− Some(changed.unwrap_or(base))
1862−/// `width` or `height`.
1863−#[derive(Clone, Copy, PartialEq, Eq)]
1869−/// What a `width` or `height` says.
1870−#[derive(Clone, Copy, PartialEq, Eq)]
1874− /// A size of its own (`width 300`)
1879− fn of(value: &str) -> Size {
1880− match value.trim() {
1881− "fill" => Size::Fill,
1882− "shrink" => Size::Shrink,
3786+ out.push_str(&css[start..i]);
3787+ prev = bytes.get(i - 1).copied();
1888−/// The declarations `fill` and `shrink` make in a parent laid out along
3792+/// Scan generated CSS for literal property values that repeat often enough
1889−/// `axis` (`None`: not a flex row or column). Along the parent's direction,
3793+/// that substituting them with an auto-named custom property would reduce
1890−/// `fill` takes the remaining space and `shrink` keeps the content's size;
3794+/// total byte count. Returns the rewritten CSS and any new vars that should
1891−/// across it (or outside flex), `fill` is the full size and `shrink` fits
3795+/// be appended to `:root`.
1892−/// the content.
3796+///
1893−fn sizing(dim: Dim, size: Size, axis: Option<Axis>) -> &'static [(&'static str, &'static str)] {
3797+/// The algorithm only promotes a value if it strictly saves bytes after
1894− match (dim, size, axis) {
3798+/// accounting for the `--xN:value;` declaration overhead plus the
1895− (_, Size::Set, _) => &[],
3799+/// `var(--xN)` reference cost at each call site. Values that are already
1896− (Dim::Width, Size::Fill, Some(Axis::Row)) => &[("flex", "1"), ("min-width", "0")],
3800+/// `var(...)` references or contain `var(` calls are skipped so we never
1897− (Dim::Width, Size::Fill, _) => &[("width", "100%")],
3801+/// nest references. Names avoid collisions with `existing_vars`.
1898− (Dim::Width, Size::Shrink, Some(Axis::Row)) => &[("flex-shrink", "0")],
3802+fn auto_extract_repeats(
1899− (Dim::Width, Size::Shrink, _) => &[("width", "fit-content")],
3803+ css: &str,
1900− (Dim::Height, Size::Fill, Some(Axis::Column)) => &[("flex", "1"), ("min-height", "0")],
3804+ existing_vars: &[(String, String)],
1901− (Dim::Height, Size::Fill, _) => &[("height", "100%")],
3805+) -> (String, Vec<(String, String)>) {
1902− (Dim::Height, Size::Shrink, Some(Axis::Column)) => &[("flex-shrink", "0")],
3806+ if css.is_empty() {
1903− (Dim::Height, Size::Shrink, _) => &[("height", "fit-content")],
3807+ return (css.to_string(), Vec::new());
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] {
1912− ("flex", "0 1 auto"),
1913− ("min-width", "auto"),
1917− ("flex", "0 1 auto"),
1918− ("min-height", "auto"),
1919− ("height", "auto"),
1922−}
3809+ // Count occurrences of each distinct property value (the text between
1923−
3810+ // `:` and the next `;` or `}` at the top level of a declaration block,
1924−/// What an element's attributes under some prefixes say about its size.
3811+ // ignoring balanced parentheses so that e.g. `rgba(...)` stays intact).
1925−#[derive(Default)]
3812+ let bytes = css.as_bytes();
1926−struct Sizes {
3813+ let mut counts: HashMap<String, usize> = HashMap::new();
1927− /// The last `width` and `height`
3814+ let mut depth: i32 = 0;
1928− width: Option<Size>,
3815+ let mut i = 0;
1929− height: Option<Size>,
3816+ while i < bytes.len() {
1930− /// A `fill` or `shrink` for the width / height is among them (a later
3817+ match bytes[i] {
1931− /// size may replace it)
3818+ b'{' => {
1932− width_word: bool,
3819+ depth += 1;
1933− height_word: bool,
3820+ i += 1;
1934− /// It writes `flex`, one of its longhands (`flex-grow`, `flex-shrink`,
3821+ continue;
1935− /// `flex-basis`), `min-width` or `min-height` itself
3822+ }
1936− flex: bool,
3823+ b'}' => {
1937− flex_grow: bool,
3824+ if depth > 0 {
1938− flex_shrink: bool,
3825+ depth -= 1;
1939− flex_basis: bool,
3826+ }
1940− min_width: bool,
3827+ i += 1;
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;
3828 continue;
1955− if condition.holds_at(at) {
1956− read.push((condition, name, value));
1959− read.sort_by_cached_key(|(condition, _, _)| condition.order());
1960− for (_, name, value) in read {
1963− let size = Size::of(value);
1964− sizes.width = Some(size);
1965− sizes.width_word |= size != Size::Set;
1968− let size = Size::of(value);
1969− sizes.height = Some(size);
1970− sizes.height_word |= size != Size::Set;
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,
1981− sizes
3832+ if depth > 0 && bytes[i] == b':' {
1982− }
3833+ // Skip past `:` then walk to the terminator.
1983−
3834+ let start = i + 1;
1984− /// The element writes `property` itself: a layout word leaves it alone.
3835+ let mut end = start;
1985− fn writes(&self, property: &str) -> bool {
3836+ let mut pdepth = 0i32;
1986− match property {
3837+ while end < bytes.len() {
1987− "flex" => self.flex,
3838+ match bytes[end] {
1988− "flex-grow" => self.flex || self.flex_grow,
3839+ b'(' => pdepth += 1,
1989− "flex-shrink" => self.flex || self.flex_shrink,
3840+ b')' => {
1990− "flex-basis" => self.flex || self.flex_basis,
3841+ if pdepth > 0 {
1991− "min-width" => self.min_width,
3842+ pdepth -= 1;
1992− "min-height" => self.min_height,
3843+ }
1993− "width" => self.width == Some(Size::Set),
1994− "height" => self.height == Some(Size::Set),
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
2003− fn push(&self, css: &mut String, property: &str, value: &str) {
2004− if property == "flex" && !self.flex {
2005− let longhands = match value {
2007− ("flex-grow", "1"),
2008− ("flex-shrink", "1"),
2009− ("flex-basis", "0%"),
2011− // The reset, `0 1 auto`
2013− ("flex-grow", "0"),
2014− ("flex-shrink", "1"),
2015− ("flex-basis", "auto"),
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);
3845+ b';' | b'}' if pdepth == 0 => break,
3846+ b'{' if pdepth == 0 => break,
2024− return;
3849+ end += 1;
3851+ let val = css[start..end].trim();
3852+ if !val.is_empty() && !val.starts_with("var(") && !val.contains("var(") {
3853+ *counts.entry(val.to_string()).or_default() += 1;
2027− if !self.writes(property) {
3858+ i += 1;
2028− push_css(css, property, value);
3859+ }
3861+ // Decide which values are worth extracting. A value of length L appearing
3862+ // N times costs N*L bytes inline; promoting it costs (L + 6) for the
3863+ // `--hK:V;` declaration plus N * ref_len for the call sites. We estimate
3864+ // ref_len optimistically as `var(--h0)` (9 bytes) and fall back to 10 for
3865+ // two-digit indices, which only affects very large extraction counts.
3866+ let existing: std::collections::HashSet<&str> =
3867+ existing_vars.iter().map(|(n, _)| n.as_str()).collect();
3868+ let mut candidates: Vec<(String, usize)> = counts
3870+ .filter(|(_, n)| *n >= 2)
3872+ // Stable, deterministic ordering — longest values first, tiebreak by text.
3873+ candidates.sort_by(|a, b| {
3876+ .then_with(|| a.0.cmp(&b.0))
3879+ let mut extracted: Vec<(String, String)> = Vec::new();
3880+ let mut next_idx: usize = 0;
3881+ for (value, n) in candidates {
3882+ let l = value.len();
3883+ // Allocate the next unused `--hN` name.
3884+ let (name, ref_len) = loop {
3885+ let candidate = format!("--h{}", next_idx);
3887+ let rl = candidate.len() + 6; // `var(` + name + `)`
3888+ if !existing.contains(candidate.as_str())
3889+ && !extracted.iter().any(|(n, _)| *n == candidate)
3891+ break (candidate, rl);
3894+ // Skip if promotion would not strictly reduce byte count.
3895+ // Before: n * l bytes. After: (l + name.len() + 2) for the :root
3896+ // declaration (`<name>:<value>;`) plus n * ref_len for the sites.
3897+ let decl_overhead = l + name.len() + 2;
3898+ let before = n * l;
3899+ let after = decl_overhead + n * ref_len;
3900+ if after < before {
3901+ extracted.push((name, value));
3903+ // Rewind the index so the next value can reuse this slot.
3908+ if extracted.is_empty() {
3909+ return (css.to_string(), Vec::new());
3911+ let new_css = substitute_css_vars(css, &extracted);
3912+ (new_css, extracted)
2033−/// The rule that gives an element's `fill` and `shrink`, as its attributes
3915+/// Format a `line-height` value. CSS accepts either a unitless multiplier
2034−/// under the at-rules `at` set them, their meaning in a parent laid out
3916+/// (e.g. `1.5`) or a length (e.g. `24px`). Plain integers in htmlang source
2035−/// along `axis`. Every other property a layout word could have set is put
3917+/// are ambiguous: `[line-height 24]` was historically emitted as `24` (which
2036−/// back to its initial value, so the rule is right whichever earlier rule
3918+/// CSS interprets as 24× font-size — almost never what anyone wants). Treat
2037−/// it overrides. Properties the element writes itself are left alone.
3919+/// integers ≥ 2 as pixel lengths; anything with a decimal, an existing unit,
2038−fn sizing_rule(attrs: &[Attribute], at: &[usize], axis: Axis) -> String {
3920+/// or the value `0`/`1` passes through unchanged.
2039− let sizes = Sizes::of(attrs, &Condition::at_only(at));
3921+fn css_line_height(value: &str) -> String {
2040− let mut sets: Vec<(&str, &str)> = Vec::new();
3922+ let v = value.trim();
2041− let mut resets: Vec<(&str, &str)> = Vec::new();
3923+ if v == "0" || v == "1" {
2042− for (dim, size, word) in [
3924+ return v.to_string();
2043− (Dim::Width, sizes.width, sizes.width_word),
2044− (Dim::Height, sizes.height, sizes.height_word),
2049− if let Some(size) = size {
2050− sets.extend_from_slice(sizing(dim, size, Some(axis)));
2052− resets.extend_from_slice(&sizing_properties(dim));
2054− let mut css = String::new();
3926+ if v.contains('.') {
2055− let mut written: Vec<&str> = Vec::new();
3927+ return v.to_string();
2056− for &(property, value) in &resets {
2057− if sets.iter().any(|&(p, _)| p == property) || written.contains(&property) {
2060− written.push(property);
2061− sizes.push(&mut css, property, value);
2063− for &(property, value) in &sets {
3929+ if CSS_UNITS.iter().any(|u| v.ends_with(u)) || v.ends_with("px") {
2064− sizes.push(&mut css, property, value);
3930+ return v.to_string();
2066− css
3932+ if v.starts_with("var(")
3933+ || v.starts_with("calc(")
3934+ || v.starts_with("clamp(")
3935+ || v.starts_with("min(")
3936+ || v.starts_with("max(")
3938+ return v.to_string();
3940+ // Plain integer — treat as pixel length.
3941+ if v.chars().all(|c| c.is_ascii_digit()) {
3942+ return format!("{}px", v);
2069−/// The rules an element's `fill` and `shrink` need under each chain of
3947+/// Format multiple space-separated values, each getting px if needed.
2070−/// at-rules where the direction of `flow` (its parent's) changes: `(at,
3948+fn css_px_multi(value: &str) -> String {
2071−/// body)`.
3949+ value
2072−fn sizing_changes(attrs: &[Attribute], flow: &Flow) -> Vec<(Vec<usize>, String)> {
3950+ .split_whitespace()
2073− flow.changes
3951+ .map(css_px)
2074− .iter()
3952+ .collect::<Vec<_>>()
2075− .map(|(at, axis)| (at.clone(), sizing_rule(attrs, at, *axis)))
3953+ .join(" ")
2076− .filter(|(_, body)| !body.is_empty())
2080−/// An element's generated class, with the rules keyed on its parent's
3956+fn extract_id_class(attrs: &[Attribute]) -> (Option<String>, Option<String>) {
2081−/// class that its `fill` and `shrink` need where the parent's direction
3957+ let mut id = None;
2082−/// changes under a prefix (see [`Flow`]): `:where(.a)>.b`, one class of
3958+ let mut class = None;
2083−/// specificity like any class rule.
3959+ for attr in attrs {
2084−fn element_class(elem: &Element, site: &Site, styles: &mut StyleCollector) -> Option<String> {
3960+ match attr.key.as_str() {
2085− let as_child = match site.parent.class {
3961+ "id" => id = attr.value.clone(),
2086− Some(_) => sizing_changes(&elem.attrs, site.parent),
3962+ "class" => class = attr.value.clone(),
2087− None => Vec::new(),
3963+ _ => {}
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));
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);
2101− Some(class)
3966+ (id, class)
2104−/// The `display` of a layout (nothing for text, native and void elements,
3969+/// Read image dimensions from a local file by parsing the header bytes.
2105−/// which keep HTML's own).
3970+/// Supports PNG, JPEG, GIF, WebP, AVIF, and SVG.
2106−fn layout_css(layout: Layout, inline: bool) -> &'static str {
3971+fn read_image_dimensions(path: &str) -> Option<(u32, u32)> {
2107− match (layout, inline) {
3972+ // SVG: parse as text for viewBox/width/height attributes
2108− (Layout::Column, false) => "display:flex;flex-direction:column;",
3973+ if path.ends_with(".svg") || path.ends_with(".SVG") {
2109− (Layout::Column, true) => "display:inline-flex;flex-direction:column;",
3974+ let text = std::fs::read_to_string(path).ok()?;
2110− (Layout::Row, false) => "display:flex;flex-direction:row;",
3975+ return read_svg_dimensions(&text);
2111− (Layout::Row, true) => "display:inline-flex;flex-direction:row;",
2112− (Layout::Grid, false) => "display:grid;",
2113− (Layout::Grid, true) => "display:inline-grid;",
2118−/// The declarations of the attributes under `condition` (the defaults of
3978+ let data = std::fs::read(path).ok()?;
2119−/// the element's kind are [`default_css`]'s).
3979+ if data.len() < 12 {
2120−fn attrs_to_css(attrs: &[Attribute], condition: &Condition, site: &Site) -> String {
3980+ return None;
2121− let mut css = String::new();
3981+ }
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);
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)
2143− for (index, attr) in attrs.iter().enumerate() {
2147− let Some(effective_key) = under(&attr.key, condition) else {
2150− if on_children && crate::vocab::places_in_parent(effective_key, attr.value.as_deref()) {
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()) {
2160− let val = attr.value.as_deref();
3983+ // PNG: 8-byte signature, then IHDR chunk with width/height at bytes 16-23
2161− // A style whose value came out empty (a field a record doesn't
3984+ if data.len() >= 24 && data.starts_with(b"\x89PNG\r\n\x1a\n") {
2162− // have, `${if()}` without its other branch) is left out
3985+ let w = u32::from_be_bytes([data[16], data[17], data[18], data[19]]);
2163− if val.is_some_and(|v| v.trim().is_empty()) {
3986+ let h = u32::from_be_bytes([data[20], data[21], data[22], data[23]]);
2164− continue;
3987+ return Some((w, h));
2167− match effective_key {
3990+ // GIF: "GIF87a" or "GIF89a", width/height at bytes 6-9 (little-endian)
2168− // htmlang's own words: they lay out children or place the
3991+ if data.starts_with(b"GIF87a") || data.starts_with(b"GIF89a") {
2169− // element in its parent, and mean more than one CSS property
3992+ let w = u16::from_le_bytes([data[6], data[7]]) as u32;
2170− "spacing" if !lays_out_children => {}
3993+ let h = u16::from_le_bytes([data[8], data[9]]) as u32;
2171− "spacing" => {
3994+ return Some((w, h));
2172− if let Some(v) = val {
3995+ }
2173− push_css(&mut css, "gap", &with_px("gap", v));
2177− // Sizing: `fill` and `shrink` compile against the parent's
3997+ // JPEG: scan for SOF0/SOF2 marker (0xFF 0xC0 or 0xFF 0xC2)
2178− // direction. Only the last `width` (`height`) counts, as for
3998+ if data.starts_with(b"\xff\xd8") {
2179− // any style written twice.
3999+ let mut i = 2;
2180− "width" | "height" if val.is_some_and(|v| Size::of(v) != Size::Set) => {
4000+ while i + 9 < data.len() {
2181− let later = attrs[index + 1..].iter().any(|a| {
4001+ if data[i] != 0xFF {
2182− !a.html
4002+ i += 1;
2183− && under(&a.key, condition) == Some(effective_key)
4003+ continue;
2184− && a.value.as_deref().is_some_and(|v| !v.trim().is_empty())
2189− let dim = if effective_key == "width" {
2194− let size = Size::of(val.unwrap_or_default());
2195− // What the element writes itself, which a layout word
2197− let sizes = Sizes::of(attrs, condition);
2198− for &(property, value) in sizing(dim, size, axis) {
2199− sizes.push(&mut css, property, value);
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`
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",
2218− && name == effective_key
2221− && c.holds_at(condition)
2224− .is_some_and(|v| !v.trim().is_empty() && Size::of(v) != Size::Set)
2227− let dim = if effective_key == "width" {
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);
2238− if let Some(v) = val {
2239− push_css(&mut css, effective_key, &with_px(effective_key, v));
2242−
4005+ let marker = data[i + 1];
2243− // Alignment: auto margins, which work along either direction.
4006+ if marker == 0xC0 || marker == 0xC2 {
2244− // They are written last, so a `margin` on the same element
4007+ let h = u16::from_be_bytes([data[i + 5], data[i + 6]]) as u32;
2245− // keeps its other sides (`center-x, margin 20`)
4008+ let w = u16::from_be_bytes([data[i + 7], data[i + 8]]) as u32;
2246− "center-x" => {
4009+ return Some((w, h));
2247− push_css(&mut aligned, "margin-left", "auto");
2248− push_css(&mut aligned, "margin-right", "auto");
2250− "center-y" => {
4011+ if i + 3 < data.len() {
2251− push_css(&mut aligned, "margin-top", "auto");
4012+ let len = u16::from_be_bytes([data[i + 2], data[i + 3]]) as usize;
2252− push_css(&mut aligned, "margin-bottom", "auto");
4013+ i += 2 + len;
2254− "align-left" => push_css(&mut aligned, "margin-right", "auto"),
4017+ }
2255− "align-right" => push_css(&mut aligned, "margin-left", "auto"),
4018+ }
2256− "align-top" => push_css(&mut aligned, "margin-bottom", "auto"),
2257− "align-bottom" => push_css(&mut aligned, "margin-top", "auto"),
2259− "wrap" if lays_out_children => push_css(&mut css, "flex-wrap", "wrap"),
4020+ // WebP: "RIFF" ... "WEBP", VP8 header at byte 20
2260− "wrap" => {}
4021+ if data.len() >= 30 && &data[..4] == b"RIFF" && &data[8..12] == b"WEBP" {
4022+ if &data[12..16] == b"VP8 " && data.len() >= 30 {
4023+ let w = u16::from_le_bytes([data[26], data[27]]) as u32 & 0x3FFF;
4024+ let h = u16::from_le_bytes([data[28], data[29]]) as u32 & 0x3FFF;
4025+ return Some((w, h));
4027+ if &data[12..16] == b"VP8L" && data.len() >= 25 && data[21] == 0x2F {
4028+ let bits = u32::from_le_bytes([data[22], data[23], data[24], data[25]]);
4029+ let w = (bits & 0x3FFF) + 1;
4030+ let h = ((bits >> 14) & 0x3FFF) + 1;
4031+ return Some((w, h));
2262− // Grid
4035+ // AVIF: ISOBMFF container with "ftyp" box containing "avif"/"avis" brand,
2263− "grid-cols" | "grid-rows" if !lays_out_children => {}
4036+ // then "ispe" box with width/height
2264− "grid-cols" | "grid-rows" => {
4037+ if data.len() >= 12 && &data[4..8] == b"ftyp" {
2265− if let Some(v) = val {
4038+ let brand = &data[8..12];
2266− let property = if effective_key == "grid-cols" {
4039+ if brand == b"avif" || brand == b"avis" || brand == b"mif1" {
2267− "grid-template-columns"
4040+ return read_avif_dimensions(&data);
2269− "grid-template-rows"
4042+ }
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)),
2277− "col-span" | "row-span" => {
2278− if let Some(v) = val {
2279− let property = if effective_key == "col-span" {
2284− push_css(&mut css, property, &format!("span {}", v));
2288− // CSS's `line-clamp` has no support yet without its
4044+ None
2289− // `-webkit-` fallback, which needs a box to clamp
4045+}
2291− if let Some(v) = val {
2292− push_css(&mut css, "display", "-webkit-box");
2293− push_css(&mut css, "-webkit-line-clamp", v);
2294− push_css(&mut css, "-webkit-box-orient", "vertical");
2295− push_css(&mut css, "overflow", "hidden");
2299− // Every other name is a CSS property (standard, custom,
4047+/// Parse SVG viewBox or width/height attributes to get dimensions.
2300− // vendor-prefixed, or one htmlang doesn't know, which the
4048+fn read_svg_dimensions(text: &str) -> Option<(u32, u32)> {
2301− // parser warned about), written under its own name with the
4049+ // Try viewBox first: viewBox="minX minY width height"
2302− // value as written, except for `px` after a bare number where
4050+ if let Some(vb_start) = text.find("viewBox=\"") {
2303− // the property takes a length
4051+ let rest = &text[vb_start + 9..];
2304− key if crate::vocab::is_property_name(key) => {
4052+ if let Some(end) = rest.find('"') {
2305− if let Some(v) = val {
4053+ let parts: Vec<&str> = rest[..end].split_whitespace().collect();
2306− push_css(&mut css, key, &with_px(key, v));
4054+ if parts.len() == 4
2307− }
4055+ && let (Ok(w), Ok(h)) = (parts[2].parse::<f64>(), parts[3].parse::<f64>())
4059+ return Some((w.round() as u32, h.round() as u32));
2313−
4063+ // Fall back to width/height attributes on <svg>
2314− css.push_str(&aligned);
4064+ let svg_tag = text.find("<svg")?;
2315− css
4065+ let tag_end = text[svg_tag..].find('>')? + svg_tag;
4066+ let tag = &text[svg_tag..tag_end];
4067+ let w = extract_svg_attr(tag, "width")?;
4068+ let h = extract_svg_attr(tag, "height")?;
2318−fn push_css(css: &mut String, prop: &str, value: &str) {
4072+fn extract_svg_attr(tag: &str, attr: &str) -> Option<u32> {
2319− css.push_str(prop);
4073+ let needle = format!("{}=\"", attr);
2320− css.push(':');
4074+ let start = tag.find(&needle)? + needle.len();
2321− css.push_str(value);
4075+ let rest = &tag[start..];
2322− css.push(';');
4076+ let end = rest.find('"')?;
4077+ let val = rest[..end].trim_end_matches("px");
4078+ val.parse::<f64>().ok().map(|v| v.round() as u32)
2325−fn extract_id_class(attrs: &[Attribute]) -> (Option<String>, Option<String>) {
4081+/// Parse AVIF (ISOBMFF) container to find ispe box with image dimensions.
2326− let mut id = None;
4082+fn read_avif_dimensions(data: &[u8]) -> Option<(u32, u32)> {
2327− let mut class = None;
4083+ // Walk ISOBMFF boxes looking for "ispe" (image spatial extents)
2328− for attr in attrs.iter().filter(|a| a.html) {
4084+ let mut i = 0;
2329− match attr.key.as_str() {
4085+ while i + 8 <= data.len() {
2330− "id" => id = attr.value.clone(),
4086+ let box_size =
2331− "class" => class = attr.value.clone(),
4087+ u32::from_be_bytes([data[i], data[i + 1], data[i + 2], data[i + 3]]) as usize;
2332− _ => {}
4088+ let box_type = &data[i + 4..i + 8];
4092+ let box_end = (i + box_size).min(data.len());
4093+ // ispe box: 4 bytes version/flags + 4 bytes width + 4 bytes height
4094+ if box_type == b"ispe" && box_end >= i + 20 {
4095+ let w = u32::from_be_bytes([data[i + 12], data[i + 13], data[i + 14], data[i + 15]]);
4096+ let h = u32::from_be_bytes([data[i + 16], data[i + 17], data[i + 18], data[i + 19]]);
4097+ return Some((w, h));
4099+ // Recurse into container boxes (meta, iprp, ipco)
4102+ b"meta" | b"iprp" | b"ipco" | b"moov" | b"trak" | b"mdia"
4104+ let header_size = if box_type == b"meta" { 12 } else { 8 };
4105+ if i + header_size < box_end
4106+ && let Some(dims) = read_avif_dimensions(&data[i + header_size..box_end])
2335− (id, class)
4113+ None
2338fn html_escape(s: &str) -> String {
4116fn html_escape(s: &str) -> String {
@@ -2373,24 +4151,10 @@ fn base64_encode(data: &[u8]) -> String {
2373/// Generate a standard v3 source map with VLQ-encoded mappings.
4151/// Generate a standard v3 source map with VLQ-encoded mappings.
2374/// Compatible with browser devtools and source map tooling.
4152/// Compatible with browser devtools and source map tooling.
2375pub fn generate_source_map(doc: &Document, source_file: &str) -> String {
4153pub fn generate_source_map(doc: &Document, source_file: &str) -> String {
2376− source_map_for_html(&generate_dev(doc), source_file)
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 {
2382 let mut mappings: Vec<(usize, usize)> = Vec::new(); // (html_line, hl_line)
4154 let mut mappings: Vec<(usize, usize)> = Vec::new(); // (html_line, hl_line)
2383− for (idx, line) in html.lines().enumerate() {
4155+ collect_source_lines(&doc.nodes, &mut mappings);
2384− if let Some(pos) = line.find("data-hl-line=\"") {
4156+ mappings.sort_by_key(|m| m.0);
2385− let digits: String = line[pos + "data-hl-line=\"".len()..]
4157+ mappings.dedup_by_key(|m| m.0);
2387− .take_while(|c| c.is_ascii_digit())
2389− if let Ok(hl_line) = digits.parse::<usize>() {
2390− mappings.push((idx + 1, hl_line));
2395 // Build VLQ-encoded mappings string.
4159 // Build VLQ-encoded mappings string.
2396 // Each generated line is separated by ';'. Each segment within a line is
4160 // Each generated line is separated by ';'. Each segment within a line is
@@ -2450,30 +4214,60 @@ fn vlq_encode(value: i64, out: &mut String) {
2453−#[cfg(test)]
4217+fn collect_source_lines(nodes: &[Node], mappings: &mut Vec<(usize, usize)>) {
2454−mod tests {
4218+ for node in nodes {
2455− use super::*;
4219+ if let Node::Element(elem) = node {
2456−
4220+ if elem.line_num > 0 {
2457− #[test]
4221+ mappings.push((mappings.len() + 1, elem.line_num));
2458− fn a_name_is_a_stable_hash_of_the_style() {
4222+ }
2459− // The same in every build and on every platform
4223+ collect_source_lines(&elem.children, mappings);
2460− assert_eq!(stable_hash(""), 0xf52a_15e9_a9b5_e89b);
4224+ }
2461− assert_eq!(hash_digits(35, 3), "z00");
4225+ }
2462− assert_eq!(hash_digits(u64::MAX, 13), "fsgs46211e5w3");
4226+}
2464−
4228+/// Check if a specific element kind exists anywhere in the node tree.
2465− #[test]
4229+fn has_element_kind(nodes: &[Node], target: &ElementKind) -> bool {
2466− fn a_name_taken_in_the_file_takes_more_digits() {
4230+ for node in nodes {
2467− // These two styles' hashes end in the same 7 digits
4231+ if let Node::Element(elem) = node {
2468− let mut styles = StyleCollector::new();
4232+ if elem.kind == *target {
2469− let first = styles.get_class("width:129555px;".into(), Vec::new(), String::new());
4233+ return true;
2470− let second = styles.get_class("width:170577px;".into(), Vec::new(), String::new());
4234+ }
2471− let (first, second) = (first.unwrap(), second.unwrap());
4235+ if has_element_kind(&elem.children, target) {
2472− assert_eq!(first.len(), 3 + CLASS_DIGITS, "{first}");
4236+ return true;
2473− assert_eq!(second.len(), 3 + CLASS_DIGITS + 1, "{second}");
4237+ }
2474− assert!(second.starts_with(&first), "{first} {second}");
4238+ }
2475− // The same style gets the name it got before
4239+ }
2476− let again = styles.get_class("width:170577px;".into(), Vec::new(), String::new());
4240+ false
2477− assert_eq!(again.as_deref(), Some(second.as_str()));
4241+}
4243+/// Collect unique external domains from generated HTML for DNS prefetch hints.
4244+fn collect_dns_prefetch(html: &str, dev: bool) -> String {
4245+ let mut domains = Vec::new();
4246+ let mut rest = html;
4247+ while let Some(pos) = rest.find("https://") {
4248+ let start = pos + 8; // skip "https://"
4249+ rest = &rest[start..];
4251+ .find(['/', '"', '\'', ' ', '>', ')'])
4252+ .unwrap_or(rest.len());
4253+ let domain = &rest[..end];
4254+ if !domain.is_empty() && domain.contains('.') && !domains.contains(&domain.to_string()) {
4255+ domains.push(domain.to_string());
4258+ let mut out = String::new();
4259+ for domain in &domains {
4261+ out.push_str(&format!(
4262+ "<link rel=\"dns-prefetch\" href=\"//{}\">\n",
4266+ out.push_str(&format!(
4267+ "<link rel=\"dns-prefetch\" href=\"//{}\">",