Re: [dom] Having getElementsByTagName match on localName is not "web"-compatible for IE and Firefox (#143)

OK, that's actually not far from what Blink currently does. The collection has both a `m_localName` and a `m_loweredLocalName`, where the latter is used for HTML elements in HTML documents. Changing that to use the qualified name instead sounds like it carries some risk, as presumably `getElementsByTagName('svg')` would no longer find an element with both localName and prefix 'svg'?

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