Hi,

In bug 1496720 I intend to unship most -moz-appearance values that
aren't supported by other UAs / spec.  These are mostly XUL-related
values that we use internally in our UI (and they will continue to be
available for that purpose).  Also, since -webkit-appearance is now
an alias for -moz-appearance we currently expose these values on that
property too unfortunately.  Which is why I think we should do this
sooner rather than later.

These are the values I intend to unship:
https://hg.mozilla.org/try/diff/05e54dac9610/layout/style/test/test_non_content_accessible_values.html

The spec for -webkit-appearance is:
https://compat.spec.whatwg.org/#css-non-aliased

There is some analysis of web-compat impact in the bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=1496720#c14
My conclusion is that unshipping these values will likely make our
rendering more compatible with Chrome's.


/Mats
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