Right, I meant a test like this was added in 2016: https://searchfox.org/mozilla-central/rev/b477cd37e845005dac8881427fa06a2771d993db/dom/media/test/test_eme_waitingforkey.html#32 (idl attribute) while I added a test like this in my patch: https://searchfox.org/mozilla-central/rev/b477cd37e845005dac8881427fa06a2771d993db/dom/media/test/test_eme_waitingforkey.html#32 (content attribute).
Bug 1925952 Comment 12 Edit History
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Right, I meant a test like this was added in 2016: https://searchfox.org/mozilla-central/rev/b477cd37e845005dac8881427fa06a2771d993db/dom/media/test/test_eme_waitingforkey.html#32 (idl attribute) while I added a test like this in my patch: https://searchfox.org/mozilla-central/rev/b477cd37e845005dac8881427fa06a2771d993db/testing/web-platform/tests/encrypted-media/media-element-event-handler-attributes.html#10 (content attribute).