[Gecko Bug 1703592] Deal with non-finite viewbox / viewports. #28427
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In the test-case we end up dividing viewbox/viewport, which is inf/inf,
end up with NaN, and boom.
Differential Revision: https://phabricator.services.mozilla.com/D111325
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1703592
gecko-commit: 2f2b7c9e14deccb122a8124b9072686506cdcee9
gecko-reviewers: longsonr