230270 2021-09-14 11:37:50 -0700 Improper masking during animation on method.ac 2026-01-12 09:03:05 -0800 1 1 1 Unclassified WebKit Animations WebKit Nightly Build Unspecified Unspecified NEW InRadar P2 Normal --- 1 jonlee webkit-unassigned dino graouts simon.fraser webkit-bug-importer oldest_to_newest 1793359 0 jonlee 2021-09-14 11:37:50 -0700 Load https://method.ac/ In the upper right corner is a switch to toggle light and dark mode. Click on it. While animating to light mode the bands that make up the background don't get masked by the shape of the switch. 1794423 1 graouts 2021-09-17 07:04:30 -0700 Not a recent regression, this was already broken in Safari 14.1.2. 1794428 2 graouts 2021-09-17 07:17:11 -0700 This uses border-radius to achieve the clipping of the toggle, not a mask or a clip. 1794429 3 438472 graouts 2021-09-17 07:20:43 -0700 Created attachment 438472 Reduction First stab at reducing this and slowing things down to see what's going on. Will reduce further later. 1794442 4 simon.fraser 2021-09-17 08:09:58 -0700 I think this is about changing the compositing layer tree and failing to reconfigure the clip path/mask. 1795681 5 webkit-bug-importer 2021-09-21 11:38:22 -0700 <rdar://problem/83361587> 438472 2021-09-17 07:20:43 -0700 2021-09-17 07:20:43 -0700 Reduction bug-230270-reduction.html text/html 12577 graouts PCFET0NUWVBFIGh0bWw+CjxodG1sIGxhbmc9ImVuIj4KPGhlYWQ+CiAgICA8bWV0YSBjaGFyc2V0 PSJ1dGYtOCI+CiAgICA8bWV0YSBodHRwLWVxdWl2PSJ4LXVhLWNvbXBhdGlibGUiIGNvbnRlbnQ9 ImllPWVkZ2UiPgogICAgPG1ldGEgbmFtZT0idmlld3BvcnQiIGNvbnRlbnQ9IndpZHRoPWRldmlj ZS13aWR0aCwgaW5pdGlhbC1zY2FsZT0xLCBzaHJpbmstdG8tZml0PW5vIj4KICAgIDx0aXRsZT48 L3RpdGxlPgogICAgPHN0eWxlPgoKICAgICAgICA6cm9vdCB7CiAgICAgICAgLS14MDogIDA7IAog ICAgICAgIC0teDE6ICA0cHg7IAogICAgICAgIC0teDI6ICA4cHg7IAogICAgICAgIC0teDM6ICAx MnB4OyAKICAgICAgICAtLXg0OiAgMTZweDsgCiAgICAgICAgLS14NTogIDIwcHg7IAogICAgICAg IC0teDY6ICAyNHB4OyAKICAgICAgICAtLXg3OiAgMjhweDsKICAgICAgICAtLXg4OiAgMzJweDsg 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