shift-with-overflow-status-change.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /layout-instability/shift-with-overflow-status-change.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Layout Instability: change under overflow clipping container causing shift and overflow status change at the same time</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="height: 100px"></div>

<div style="overflow: auto; width: 400px; height: 400px">

  <div id="resized" style="width: 600px; height: 100px; background: gray"></div>

  <div id="shifted" style="width: 300px; height: 100px; background: blue"></div>

</div>

<script>

promise_test(async () => {

  const watcher = new ScoreWatcher;

  // Wait for the initial render to complete.

  await waitForAnimationFrames(2);

  resized.style.width = '200px';

  resized.style.height = '200px';

  const expectedScore = computeExpectedScore(300 * (100 + 100), 100);

  assert_equals(watcher.score, 0);

  await watcher.promise;

  assert_equals(watcher.score, expectedScore);

  resized.style.width = '600px';

  resized.style.height = '100px';

  await watcher.promise;

  assert_equals(watcher.score, expectedScore * 2);

}, 'Change under overflow clipping container causing shift and overflow status change at the same time');

</script>