Fixes two WPT files (1 subtest each, both fully green):
- /html/dom/documents/dom-tree-accessors/document.head-02.html:
document.head is the first html-namespace child of the document
element whose LOCAL name is head. A createElementNS(HTML_NS,
"blah:head") element is an HTMLUnknownElement in our type system, so
the old is(Html.Head) walk skipped it; getHead now matches on
namespace + local name (and returns *Element accordingly).
- .../document.getElementsByName/document.getElementsByName-namespace.html:
getElementsByName must only consider HTML-namespace elements; the
live collection's name filter now rejects foreign elements, matching
the earlier fix for name-based access on HTMLCollections.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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