These tests are testing the "interactivity" feature which was only just added to the css-ui-4 spec and only just implemented in Chrome. I prompted mozilla-apprentice to file bug 1943864 on this and added some notes.
Bug 1943690 Comment 1 Edit History
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These tests are testing the "interactivity" css property which was only just added to the css-ui-4 spec and only just implemented in Chrome. I prompted mozilla-apprentice to file bug 1943864 on this and added some notes.