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Say that -webkit-appearance must be supported #104
I guess we want to have some wpt as well -- I thought we did for
referenced this pull request
Aug 27, 2018
LGTM, as long as we keep the list up to date with what the intersection of what Gecko and Blink/WebKit implement is (and Edge?). I think we'll have a better idea as your research in this area progresses of what to add or remove over time.
edit: I see https://github.com/web-platform-tests/wpt/pull/12700/files#diff-1dc558b0c805c24c530a22e254e454d6R8, so that's cool.