HTML API: Ensure form feed is recognized as close tag name terminator - #12936
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Form feed is ASCII whitespace. It terminates an appropriate RCDATA or RAWTEXT end tag name, but skip_rcdata() rejects it and leaves the entire special element incomplete. Cover every element routed through that scanner. SCRIPT uses a separate scanner and already has this coverage.
skip_rcdata() omits form feed from the tag-name terminator set even though it is ASCII whitespace. Valid RCDATA and RAWTEXT closers then look like text, so the processor pauses on a complete element. Accept form feed before handing the closer to the existing attribute scanner.
The test and provider leave their return contracts partly implicit. State void and the exact generator key and value shape so static analysis does not have to guess.
The regression test names only form feed, but skip_rcdata() implements a seven-character boundary contract. Testing one byte leaves the other accepted paths free to drift. Keep the terminators in a reusable provider and run the full Cartesian matrix as independent cases.
Test using WordPress PlaygroundThe changes in this pull request can previewed and tested using a WordPress Playground instance. WordPress Playground is an experimental project that creates a full WordPress instance entirely within the browser. Some things to be aware of
For more details about these limitations and more, check out the Limitations page in the WordPress Playground documentation. |
sirreal
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August 10, 2026 09:02
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westonruter
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LGTM. Nit suggestions for narrower types.
Co-authored-by: Weston Ruter <westonruter@gmail.com>
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Merged in r63179. |
pento
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Form feeds after closing tag names were not recognized, causing complete elements to appear incomplete. Developed in #12936. Props jonsurrell, westonruter. See #65372. git-svn-id: https://develop.svn.wordpress.org/trunk@63179 602fd350-edb4-49c9-b593-d223f7449a82
markjaquith
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Form feeds after closing tag names were not recognized, causing complete elements to appear incomplete. Developed in WordPress/wordpress-develop#12936. Props jonsurrell, westonruter. See #65372. Built from https://develop.svn.wordpress.org/trunk@63179 git-svn-id: http://core.svn.wordpress.org/trunk@62376 1a063a9b-81f0-0310-95a4-ce76da25c4cd
pento
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Form feeds after closing tag names were not recognized, causing complete elements to appear incomplete. Developed in #12936. Reviewed by bernhard-reiter. Merges r63179 to the 7.1 branch. Props jonsurrell, westonruter. See #65372. git-svn-id: https://develop.svn.wordpress.org/branches/7.1@63206 602fd350-edb4-49c9-b593-d223f7449a82
markjaquith
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Form feeds after closing tag names were not recognized, causing complete elements to appear incomplete. Developed in WordPress/wordpress-develop#12936. Reviewed by bernhard-reiter. Merges r63179 to the 7.1 branch. Props jonsurrell, westonruter. See #65372. Built from https://develop.svn.wordpress.org/branches/7.1@63206 git-svn-id: http://core.svn.wordpress.org/branches/7.1@62399 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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WP_HTML_Tag_Processor::skip_rcdata()omits U+000C FORM FEED from the end-tag-name terminator set. A valid closer such as</xmp\f>is treated as text, and the processor reports the complete XMP element as incomplete. The same broken scanner handles six other RCDATA and RAWTEXT elements.Add FORM FEED to the predicate. Test the complete terminator contract — space, tab, LF, FF, CR,
/, and>— against every element routed throughskip_rcdata()andskip_rawtext(). The Cartesian provider keeps all 49 cases independent and leaves the terminator provider reusable.SCRIPTuses a separate scanner that already handles the full set.Trac ticket: https://core.trac.wordpress.org/ticket/65372
Testing
WP_TESTS_SKIP_INSTALL=1 vendor/bin/phpunit --group html-apiWP_TESTS_SKIP_INSTALL=1 vendor/bin/phpunit --group=html-api-web-platform-testsvendor/bin/phpcs --standard=phpcs.xml.dist src/wp-includes/html-api/class-wp-html-tag-processor.php tests/phpunit/tests/html-api/wpHtmlTagProcessor.phpgit diff --checkpass.Use of AI Tools
AI assistance: Yes
Tool(s): OpenAI Codex
Model(s): GPT-5
Used for: Reproducing the defect, auditing related tokenizer paths, implementing the fix and tests, adversarial review, and drafting this description. The contributor reviewed the final changes and test results.
This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.