multi-clip-visual-rect.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/multi-clip-visual-rect.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Layout Instability: multi clip visual rect</title>

<link rel="help" href="https://wicg.github.io/layout-instability/" />

<style>

body { margin: 0; }

#outer { width: 200px; height: 600px; overflow: hidden; }

#inner { width: 300px; height: 150px; overflow: hidden; }

#j { position: relative; width: 300px; height: 600px; background: blue; }

</style>

<div id='outer'><div id='inner'><div id='j'></div></div></div>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="resources/util.js"></script>

<script>

promise_test(async () => {

  const watcher = new ScoreWatcher;

  // Wait for the initial render to complete.

  await waitForAnimationFrames(2);

  document.querySelector("#j").style.top = "-200px";

  // Note that, while the element moves up 200px, its visibility is

  // clipped at 0px,150px height, so the additional 200px of vertical

  // move distance is not included in the score.

  // (clip width 200) * (clip height 150)

  const expectedScore = computeExpectedScore(200 * 150, 200);

  await watcher.promise;

  assert_equals(watcher.score, expectedScore);

}, "Multi clip visual rect.");

</script>