[Webkit-unassigned] [Bug 211431] New: [WinCairo] CSS animations break raf sequence
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Mon May 4 21:14:54 PDT 2020
https://bugs.webkit.org/show_bug.cgi?id=211431
Bug ID: 211431
Summary: [WinCairo] CSS animations break raf sequence
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Windows 10
Status: NEW
Severity: Normal
Priority: P2
Component: WebCore Misc.
Assignee: webkit-unassigned at lists.webkit.org
Reporter: pfeldman at chromium.org
Creating a simple CSS animation fires random rafs every 2-20ms. In some of these rafs animated element is not moving. See console for the following snippet:
<style>button { transition: margin 500ms linear 0s; margin-left: 0; }</style>
<button id=button>Hello</button>
<script>
requestAnimationFrame(foo);
let lastFrame = performance.now();
function foo(time) {
console.log(time - lastFrame);
lastFrame = time;
console.log(button.getBoundingClientRect().x);
if (button.getBoundingClientRect().x < 100)
requestAnimationFrame(foo);
}
setTimeout(() => {
button.style.marginLeft = "100px";
});
</script>
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