forked from mirrors/gecko-dev
e9a86b7e50
Automatic update from web-platform-tests Use visual overflow rect for layout shift tracking Bug: 1141739 Change-Id: I3b41c6328bf328b6734c6eadc422c45534fe42da Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2503330 Reviewed-by: Steve Kobes <skobes@chromium.org> Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org> Cr-Commit-Position: refs/heads/master@{#821511} -- wpt-commits: 913bd234213c1cb128a33d1e78ec2c6e925f430b wpt-pr: 26310
31 lines
1.2 KiB
HTML
31 lines
1.2 KiB
HTML
<!DOCTYPE html>
|
|
<title>Layout Instability: parent and overflowing absolute child moved together</title>
|
|
<link rel="help" href="https://wicg.github.io/layout-instability/" />
|
|
<script src="/resources/testharness.js"></script>
|
|
<script src="/resources/testharnessreport.js"></script>
|
|
<script src="resources/util.js"></script>
|
|
<div id="parent" style="position: relative; left: 400px; top: 300px; width: 100px; height: 100px; background: yellow">
|
|
<div id="child" style="position: absolute; top: -300px; left: -400px; width: 100px; height: 100px; background: blue"></div>
|
|
</div>
|
|
<script>
|
|
|
|
promise_test(async () => {
|
|
const watcher = new ScoreWatcher;
|
|
|
|
// Wait for the initial render to complete.
|
|
await waitForAnimationFrames(2);
|
|
|
|
// Modify the position of the div.
|
|
const parent = document.querySelector("#parent");
|
|
parent.style.top = '400px';
|
|
|
|
// We should track parent and child separately.
|
|
const expectedScore = computeExpectedScore(100 * (100 + 100), 100) * 2;
|
|
|
|
// Observer fires after the frame is painted.
|
|
assert_equals(watcher.score, 0);
|
|
await watcher.promise;
|
|
assert_equals(watcher.score, expectedScore);
|
|
}, 'Parent and overflowing absolute child movement.');
|
|
|
|
</script>
|