visibility-hidden.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/visibility-hidden.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Layout Instability: visibility:hidden</title>

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

<div id="target" style="position: absolute; top: 0; width: 400px; height: 400px; visibility: hidden; background: blue"></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);

  // Shift target, for which no shift should be reported because it's hidden.

  document.querySelector("#target").style.top = '200px';

  await waitForAnimationFrames(2);

  // No shift should be reported.

  assert_equals(watcher.score, 0);

}, 'visibility:hidden');

</script>