Boris Chiou d90afd8a5e Bug 1882621 - Fix the serialization of mask property to avoid ambiguity. r=dholbert
Even if `mask-origin` is at its initial value `border-box`, we still have to
serialize it to avoid ambiguity iF the `mask-clip` longhand has some other
`<coord-box>` value (i.e. neither `border-box` nor `no-clip`).

Differential Revision: https://phabricator.services.mozilla.com/D203209
2024-03-01 02:07:11 +00:00
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