[Gecko Bug 1834641] Fix the serialization of mask shorthand property. #42181
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mask-image
if it is the initial value and there areany other properties which are not initial values.
mask-origin
if it is the initial value.<masking-mode>
, which should be the last one per spec.Differential Revision: https://phabricator.services.mozilla.com/D188545
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1834641
gecko-commit: 081d116d10f850a6b4a71c5f598373a388dd0feb
gecko-reviewers: emilio