fix(html): parse keywords

.changeset/itchy-zoos-swim.md

@@ -0,0 +1,5 @@
+---
+"@biomejs/biome": patch
+---
+
+Fixed an issue where the Biome HTML parser would emit a parse error when certain keywords are inside the text of HTML tags.

crates/biome_html_parser/src/syntax/mod.rs

@@ -131,7 +131,7 @@ fn parse_doc_type(p: &mut HtmlParser) -> ParsedSyntax {
 /// will emit diagnostics. We want to allow them if they have no special meaning.
 #[inline(always)]
 fn inside_tag_context(p: &HtmlParser) -> HtmlLexContext {
-    if p.options().vue {
+    if HtmlSyntaxFeatures::Vue.is_supported(p) {
         HtmlLexContext::InsideTagVue
     } else {
         HtmlLexContext::InsideTag
@@ -181,7 +181,14 @@ fn parse_element(p: &mut HtmlParser) -> ParsedSyntax {
                 HtmlLexContext::Regular
             },
         );
+
         let opening = m.complete(p, HTML_OPENING_ELEMENT);
+
+        // if the lexer found a keyword, rewind and lex as text
+        if is_at_keyword(p) {
+            p.re_lex(HtmlReLexContext::HtmlText);
+        }
+
         if is_embedded_language_tag {
             // embedded language tags always have 1 element as content
             let list = p.start();
@@ -683,3 +690,11 @@ impl TextExpression {
         Present(m.complete(p, HTML_TEXT_EXPRESSION))
     }
 }
+
+fn is_at_keyword(p: &mut HtmlParser) -> bool {
+    is_at_svelte_keyword(p) || is_at_html_keyword(p)
+}
+
+fn is_at_html_keyword(p: &mut HtmlParser) -> bool {
+    matches!(p.cur(), T![html] | T![doctype])
+}

crates/biome_html_parser/tests/html_specs/ok/text_keywords.html

@@ -0,0 +1,16 @@
+<span>html entity</span>
+<span>debug </span>
+<span>attach </span>
+<span>const </span>
+<span>render </span>
+<span>html </span>
+<span>key </span>
+<span>if </span>
+<span>else </span>
+<span>each </span>
+<span>as </span>
+<span>await </span>
+<span>then </span>
+<span>catch </span>
+<span>snippet </span>
+<span>doctype </span>