Re: [w3c/DOM-Parsing] Serialization algorithm never preserves attribute prefixes (#29)

Note also that the "Check if no special handling for XLink namespace unlike HTML serializer." test case in https://github.com/web-platform-tests/wpt/blame/master/domparsing/XMLSerializer-serializeToString.html#L218 also implicitly assumes the "firefox" behavior, not the spec behavior:
```
const root2 = (new Document()).createElement('root');
root2.setAttributeNS('http://www.w3.org/1999/xlink', 'xl:type', 'v');
assert_equals(serialize(root2), '<root xmlns:xl="http://www.w3.org/1999/xlink" xl:type="v"/>');
```
The spec currently says the output should be `<root <root xmlns:ns1="http://www.w3.org/1999/xlink" ns1:type="v"/>` since the `xl` prefix on the attribute wouldn't be preserved.

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