Check the qualified instead of the local name in the stack of open elements
Check the qualified instead of the local name in the stack of open elements

This fixes the parser's behaviour when handling elements in the MathML and
SVG namespaces.

See:
https://bugs.webkit.org/show_bug.cgi?id=113723
https://www.w3.org/Bugs/Public/show_bug.cgi?id=21308
https://www.w3.org/Bugs/Public/show_bug.cgi?id=21292

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