HTML API: Backport updates from Core - stop processing after unsupported markup #53878
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Description
WordPress/wordpress-develop#5048 fixes a bug where the HTML Processor continues to process input HTML once it encounters unsupported markup, which it shouldn't. It should stop and abort all processing.
As a blessed PR, once this is merged into Core it should need no further review here other than to make sure that the backport was properly written and applied.