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
* Remove some legacy appearance aliases that other engines don't implement. * Allow to pass with unimplemented <compat-auto> values, since per the spec the idea of these is to get them removed, see https://github.com/w3c/csswg-drafts/issues/8506 for the ones we don't implement. * Also allow the `-moz-` prefix to be implemented, because we can't quite get rid of it (people use it to remove the <input type=number> buttons with -moz-appearance: textfield and so on), and the alternative is to implement a bunch of non-standard ::-webkit- pseudo-elements. Differential Revision: https://phabricator.services.mozilla.com/D171243