HTML parser: handle missing and empty string mostly the same for DOCTYPEs #12084
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…YPEs In particular for DOCTYPE system and public identifiers when it comes to quirks mode determination to align with Chromium and WebKit which had a quirk (harhar) in their implementation. This does not remove the distinction entirely as it's still used for validation. Tests: web-platform-tests/wpt#57077. Fixes #12023.
zcorpan
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Jan 14, 2026
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Jan 14, 2026
This adds tests to verify that an empty DOCTYPE system identifier is treated the same as a missing one for quirks mode determination, aligning with Chromium and WebKit behavior. See whatwg/html#12084
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In particular for DOCTYPE system and public identifiers when it comes to quirks mode determination to align with Chromium and WebKit which had a quirk (harhar) in their implementation. This does not remove the distinction entirely as it's still used for validation.
Tests: web-platform-tests/wpt#57077.
Fixes #12023.
(See WHATWG Working Mode: Changes for more details.)
/parsing.html ( diff )