Sourced from htmlparser2's releases.

v12.0.0

What's Changed

This release aligns HTML parsing with the WHATWG spec Almost all changes are to HTML mode only — XML mode is unaffected unless noted.

Raw-text & RCDATA tags

• <iframe>, <noembed>, <noframes>, and <plaintext> are now raw-text tags, their content is no longer parsed as HTML
• <textarea> now decodes entities like <title> already did
• Self-closing <script/>, <style/>, etc. now enter their raw-text state (the / is ignored per spec) unless recognizeSelfClosing is enabled

SVG & MathML

• Tag names inside <svg> are case-adjusted per spec (foreignObject, clipPath, etc.)
• CDATA sections inside foreign content are treated as text
• Special-tag detection is disabled inside foreign content
• Stray </svg> / </math> no longer corrupt the parser's context tracking

Comments & declarations

• <!-->, <!--->, <!->, <!> now parse as valid comments per spec
• <?…> and non-DOCTYPE <!…> in HTML mode emit bogus comments instead of being silently dropped
• <!DOCTYPEhtml> (no space) is recognized as a DOCTYPE
• Unclosed comments, <!DOCTYPE, <?…, <![CDATA[… at EOF emit the correct token type

Implicit open/close

• <h1>–<h6> implicitly close other headings
• <a> closes a previous <a>
• Nested <form> is ignored when one is already open
• <image> is rewritten to <img> outside foreign content
• </> is silently ignored instead of emitted as text

Other fixes

• Fixed reset() not clearing attribute state, which could leak data across parseComplete() calls

fb55/htmlparser2#2387

Full Changelog: fb55/htmlparser2@v11.0.0...v12.0.0

v11.0.0

Breaking Changes

• The module is now ESM only fb55/htmlparser2#2381
  • CommonJS require() is not supported in legacy environment anymore. Use import instead.
  • The minimum Node.js version is now 20.19.0.
• Dependencies have been bumped to their latest major versions: domhandler v6, domutils v4, domelementtype v3, entities v8.

Features

• Added WebWritableStream for the Web Streams API, enabling direct piping from fetch() response bodies into the parser fb55/htmlparser2#2376

Bug Fixes

... (truncated)

• c73fec0 12.0.0
• e32389a fix: align HTML parsing with the spec (#2387)
• cc400f1 build(deps-dev): Bump @​biomejs/biome from 2.4.7 to 2.4.8 (#2386)
• 698aa5b build(deps): Bump domutils from 4.0.1 to 4.0.2 (#2385)
• b781f62 11.0.0
• f2bb3b0 docs: expand README (#2384)
• 9008dfd feat: add WebWritableStream for Web Streams API support (#2376)
• 21dedfa fix(tokenizer): require full --> to close comments in xmlMode (#2383)
• f2daa22 fix(tokenizer): align edge-case parsing behavior with HTML spec (#2382)
• 24ca601 build(deps-dev): Bump vitest from 4.0.18 to 4.1.0 (#2371)
• Additional commits viewable in compare view

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