222939 2021-03-08 13:37:41 -0800 [Web Animations] setKeyframes does not preserve animation's current offset 2021-03-10 07:52:27 -0800 1 1 1 Unclassified WebKit Animations Safari 14 Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 ldebeasi graouts dino graouts graouts webkit-bug-importer oldest_to_newest 1737269 0 422613 ldebeasi 2021-03-08 13:37:41 -0800 Created attachment 422613 Code reproduction When using setKeyframes() on an animation, WebKit does not preserve the animation's current offset. For example, if an animation is at 100% progress and setKeyframes() is called, WebKit will reset the animation's progress to 0%. Steps to reproduce: 1. Open attached code reproduction in either Safari for iOS or macOS. 2. Observe that a blue square translates from left to right and then stops. 3. Press "Update Keyframes". You should notice that the square jumps back to the left/starting position. Expected Behavior: I would expect that after pressing "Update Keyframes" that the square stays at its ending position. Actual Behavior: The square is reset back to its starting position. Other Information: - I can reproduce this in STP 121 and iOS 14.5, though I can reproduce this on stable releases as well. - Both Chrome and Firefox preserve the animation's current offset as expected. - This is only an issue if "fill: 'both'" is set on the animation. 1737500 1 webkit-bug-importer 2021-03-09 01:11:34 -0800 <rdar://problem/75207793> 1737503 2 422677 graouts 2021-03-09 01:22:53 -0800 Created attachment 422677 Simplified testcase Simplified the test case to not involve accelerated animations and not require interaction. 1737504 3 graouts 2021-03-09 01:24:53 -0800 Interestingly, the output of animation.effect.getComputedTiming() shows the expected values, so I think this is purely about presentation and not the animation model. 1737557 4 graouts 2021-03-09 07:26:36 -0800 What happens is that calling seyKeyframes() empties m_blendingKeyframes and we rely on that to have KeyframeEffect::animatedProperties() return the effect's properties inside of DocumentTimeline::animationCanBeRemoved(). Because we are not aware of any animated properties, the animation is marked as removable and retired from the keyframe effect stack, and thus it is no longer invalidated during the ensuing style update. I think all this needs is for KeyframeEffect::animatedProperties() to return properties from the parsed keyframes until the next style update when m_blendingKeyframes will be reset. 1737572 5 422700 graouts 2021-03-09 08:23:56 -0800 Created attachment 422700 Patch 1737692 6 ews-feeder 2021-03-09 12:09:54 -0800 Committed r274165: <https://commits.webkit.org/r274165> All reviewed patches have been landed. Closing bug and clearing flags on attachment 422700. 1738057 7 ldebeasi 2021-03-10 07:41:27 -0800 That was fast, thank you! I will keep an eye out for this fix whenever it lands in STP. 1738062 8 graouts 2021-03-10 07:52:27 -0800 (In reply to Liam DeBeasi from comment #7) > That was fast, thank you! I will keep an eye out for this fix whenever it > lands in STP. Thanks for filing with a great reduction, it really helps. It won't be in the immediate next STP release but in the one after that. 422613 2021-03-08 13:37:41 -0800 2021-03-08 13:37:41 -0800 Code reproduction index.html text/html 1231 ldebeasi PCFET0NUWVBFIGh0bWw+CjxodG1sPgogIDxoZWFkPgogICAgPHRpdGxlPldlYiBBbmltYXRpb24g LSBzZXRLZXlmcmFtZXMoKTwvdGl0bGU+CiAgICA8bWV0YSBuYW1lPSJ2aWV3cG9ydCIgY29udGVu dD0idmlld3BvcnQtZml0PWNvdmVyLCB3aWR0aD1kZXZpY2Utd2lkdGgsIGluaXRpYWwtc2NhbGU9 MS4wLCBtaW5pbXVtLXNjYWxlPTEuMCwgbWF4aW11bS1zY2FsZT0xLjAsIHVzZXItc2NhbGFibGU9 bm8iPgogICAgPG1ldGEgbmFtZT0iYXBwbGUtbW9iaWxlLXdlYi1hcHAtY2FwYWJsZSIgY29udGVu dD0ieWVzIiAvPgogICAgPG1ldGEgbmFtZT0iYXBwbGUtbW9iaWxlLXdlYi1hcHAtc3RhdHVzLWJh ci1zdHlsZSIgY29udGVudD0iYmxhY2siIC8+CiAgICAKICAgIDxzdHlsZT4KICAgICAgZGl2IHsK ICAgICAgICB3aWR0aDogMTAwcHg7CiAgICAgICAgaGVpZ2h0OiAxMDBweDsKICAgICAgICAKICAg ICAgICBvcGFjaXR5OiAwLjU7CiAgICAgICAgYmFja2dyb3VuZDogYmx1ZTsKICAgICAgfQogICAg PC9zdHlsZT4KICA8L2hlYWQ+CiAgPGJvZHk+CiAgICA8ZGl2PjwvZGl2PiA8YnIgLz4KICAgIDxi 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