29 lines
1 KiB
HTML
29 lines
1 KiB
HTML
<!DOCTYPE html>
|
|
<title>Layout Instability: movement of descendant of sticky positioned</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 style="position: sticky; width: 400px; height: 300px; top: 0">
|
|
<div id="child" style="position: relative; width: 300px; height: 200px; background: yellow"></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 child = document.querySelector("#child");
|
|
child.style.top = '100px';
|
|
|
|
const expectedScore = computeExpectedScore(300 * (200 + 100), 100);
|
|
|
|
// Observer fires after the frame is painted.
|
|
assert_equals(watcher.score, 0);
|
|
await watcher.promise;
|
|
assert_equals(watcher.score, expectedScore);
|
|
}, 'Movement of descendant of sticky positioned.');
|
|
|
|
</script>
|