Environment information

CLI:
  Version:                      2.4.14
  Color support:                true

Platform:
  CPU Architecture:             aarch64
  OS:                           macos

Environment:
  JS_RUNTIME_VERSION:           v25.9.0
  JS_RUNTIME_NAME:              node

What happened?

Since 2.4.14, the HTML parser rejects any text node that starts with the word of. The same input parses cleanly on 2.4.13.

Minimal repro (.html or .astro):

<p>of</p>

Output:

test.html:1:4 parse
  × Unexpected value or character.
  > 1 │ <p>of</p>
      │    ^^
  i Expected one of:
  - element
  - text

A few notes from poking at it:

• Only the literal word of triggers it. for, in, from, as, typeof, etc. are all fine.
• Only matters when of is the first token of a text node. <p>The of</p> parses fine; <p>of Y</p> does not.
• Common case in real content is after a closing inline tag: <p>The <strong>X</strong> of Y.</p> fails because the space after </strong> starts a new text node beginning with of.
• Affects both the HTML and Astro parsers (shared lexer).

Bisected to 2.4.14:

The only HTML-parser change in 2.4.14 is #10178 (fix(parse/html): relex keywords as text in text contexts), which looks like the likely source. That change taught the parser to relex html/doctype as text after void elements, and seems to have left of mis-classified as a non-text keyword in this position.

Steps to reproduce:

1. mkdir biome-of-bug && cd biome-of-bug
2. npm init -y && npm i -D @biomejs/biome@2.4.14
3. printf '<p>of</p>\n' > test.html
4. npx biome check test.html --files-ignore-unknown=false

Expected result

The parser should accept <p>of</p> as plain text content, identical to 2.4.13 behaviour.

Code of Conduct

• I agree to follow Biome's Code of Conduct