Drop contents of style, script, and metadata tags#16
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The HTML parser's unknown-tag fallback strips the wrapper but still descends into children, which emitted the CSS inside <style> (and would do the same for <script> bodies) as text in the output. Add an IGNORED_TAGS set checked before the unknown-tag fallback so style/script/head/title/noscript/template subtrees are skipped entirely.
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<style>(and would do the same for<script>bodies) as text in the output.IGNORED_TAGSset checked before the unknown-tag fallback sostyle/script/head/title/noscript/templatesubtrees are skipped entirely.