Dennis Snell 1139a51e9c HTML API: Parse DOCTYPE tokens and set HTML parser mode accordingly.
This patch adds until-now missing code to parse the structure of HTML DOCTYPE declarations. The DOCTYPE is mostly unused but can dictate the document compatability mode, which governs whether CSS class names match in a ASCII-case-insensitive way or not, and whether TABLE elements close an open P element.

The DOCTYPE information is made available through a new method on the Tag Processor, `get_doctype_info()`.

Developed in https://github.com/wordpress/wordpress-develop/pull/7195
Discussed in https://core.trac.wordpress.org/ticket/61576

Props dmsnell, jonsurrell.
See #61576.


git-svn-id: https://develop.svn.wordpress.org/trunk@58925 602fd350-edb4-49c9-b593-d223f7449a82
2024-08-23 14:53:59 +00:00
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