[Gecko Bug 1562257] part 2. Fix parsing of margin attributes on <body> match the spec. #17758
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The various margin attributes on are "pixel length attributes" in the
spec, which should get parsed as non-negative integers. That said, Chrome and
Safari implement marginwidth, marginheight, marginleft, and margintop as
"dimension attributes" instead, and don't implement marginright and marginbottom
at all.
Differential Revision: https://phabricator.services.mozilla.com/D36372
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1562257
gecko-commit: 399e8e089eda6d6cba06bb37c3aadacc607fe6b6
gecko-integration-branch: central
gecko-reviewers: mccr8