content-visibility-auto-offscreen.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/content-visibility-auto-offscreen.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Layout Instability: off-screen content-visibility:auto content</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>

<script>

// These scripts need to be before the contents because we need to ensure no

// layout shifts during page load.

promise_test(async () => {

  const watcher = new ScoreWatcher;

  // Wait for the initial render to complete.

  await waitForAnimationFrames(2);

  window.scrollTo(0, 100000 + 100);

  await waitForAnimationFrames(2);

  assert_equals(watcher.score, 0);

  // This should report a layout shift as target is now visible.

  target.style.top = '100100px';

  await watcher.promise;

  const expectedScore = computeExpectedScore(100 * 100, 1);

  assert_approx_equals(watcher.score, expectedScore, 1e-8, "before scroll to top");

  // No new layout shift should be reported when target is scrolled out of screen.

  window.scrollTo(0, 0);

  await waitForAnimationFrames(2);

  assert_approx_equals(watcher.score, expectedScore, 1e-8, "after scroll to top");

}, 'off-screen content-visibility:auto');

</script>

<style>

  .auto {

    content-visibility: auto;

    contain-intrinsic-size: 1px;

    width: 100px;

</style>

<div class=auto>

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

</div>

<div id="target" class=auto style="position: relative; top: 100000px">

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

</div>