Fix handle AssertionError from html.parser on edge-case markup#51
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Python 3.13's html.parser throws AssertionError when encountering certain edge-case markup like `<<>>` in the content. This occurs in the _RawHTMLPreprocessor which feeds raw markdown into HTMLParser to extract anchor IDs. Wrap the parser.feed() call in a try/except to catch AssertionError and RuntimeError, allowing the build to continue gracefully. Fixes #4001
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Python 3.13's html.parser throws AssertionError when encountering certain edge-case markup like
<<>>in the content. This occurs in the _RawHTMLPreprocessor which feeds raw markdown into HTMLParser to extract anchor IDs.Wrap the parser.feed() call in a try/except to catch AssertionError and RuntimeError, allowing the build to continue gracefully.
Fixes mkdocs/mkdocs#4001
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docs/about/release-notes.mdupdated (if applicable)