"animation.ready" is relatively new so it will unlikely cause webcompat issues (IIRC Safari shipped it this year), yes. The test case I wrote initially happened to be found when I use animation.ready in a test for fission, without knowing what causes this animation.ready failure, it's quite hard to tell whether there are other issues causes by the same problem, and the issue might be real problems in the wild.
Bug 1578309 Comment 42 Edit History
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"animation.ready" is relatively new so it will unlikely cause webcompat issues (IIRC Safari shipped it this year), yes. The test case I wrote initially happened to be found when I used animation.ready in a test for fission, without knowing what causes this animation.ready failure, it's quite hard to tell whether there are other issues causes by the same problem, and the issue might be real problems in the wild.
"animation.ready" is relatively new so it will unlikely cause webcompat issues (IIRC Safari shipped it this year), yes. The test case I wrote initially happened to be found when I used animation.ready in a test for fission, without knowing what causes this animation.ready failure, it's quite hard to tell whether there are other issues causes by the same problem, and the issues might be real problems in the wild.