scroller-with-child.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-view-transitions/scoped/scroller-with-child.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html class=reftest-wait>

<head>

<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">

<link rel="match" href="scroller-with-child-ref.html">

<script src="/common/reftest-wait.js"></script>

<script src="/web-animations/testcommon.js"></script>

<style>

body { margin: 20px; font: 18pt monospace; line-height: 30px; }

#scope { overflow: auto; contain: layout; padding: 20px;

  width: 200px; height: 100px; border: 20px solid #acf; }

#part { view-transition-name: foo;

  background: #fea; padding: 10px; border: 4px solid orange;

  width: 150px; height: 180px; margin: 20px 0 0 90px; }

#scope::view-transition-group(*) { animation-play-state: paused; }

#scope::view-transition-new(*) { animation: unset; opacity: 1; }

#scope::view-transition-old(*) { animation: unset; opacity: 0; }

</style>

</head>

<body>

<div id=scope>Hello

  <div id=part>child</div>

</div>

<script>

failIfNot(scope.startViewTransition, "Missing element.startViewTransition");

async function runTest() {

  scope.scrollBy(40, 24);

  await waitForCompositorReady();

  const t = scope.startViewTransition(() => {

    scope.firstChild.nodeValue = "World";

    part.style.background = "#fac";

});

  await t.ready;

  takeScreenshot();

onload = () => runTest();

</script>

</body>

</html>