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Just like other documents without attachment to anything whatsoever, DOMParser documents should use "about:blank" as their URL. (And ideally implementations align.)
I added a note to the spec: https://bitbucket.org/ms2ger/dom-parsing-and-serialization/changeset/925777e01392 https://bitbucket.org/ms2ger/dom-parsing-and-serialization/changeset/a1cb2f1ed722 It doesn't matter all that much to me what the outcome ends up being.