[Gecko Bug 1709415] Support -webkit-image-set as a parse-time alias to image-set(). #28972
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The webkit syntax is an strict subset of the modern one, so this should
be doable, and is the simplest.
If my reading of the WebKit code is correct it should also be the way
WebKit deals with this (except they restrict -webkit-image-set() syntax
artificially).
Differential Revision: https://phabricator.services.mozilla.com/D114912
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1709415
gecko-commit: 01bca848cb09b426c0c1c5f34d32dbe3fa5b9aa7
gecko-reviewers: karlcow, twisniewski