transition-to-prerender.html | Explore in Territory

<!DOCTYPE html>
<html class="reftest-wait">
<title>View transitions: basic cross-document navigation to a prerender</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="transition-to-prerender-ref.html">
<script src="/common/utils.js"></script>
<script src="/common/reftest-wait.js"></script>
<script src="/speculation-rules/resources/utils.js"></script>
<script src="/speculation-rules/prerender/resources/utils.js"></script>
<style>
@view-transition {
  navigation: auto;
}
html {
  background-color: red;
}
html.outgoing {
  background-color: cornflowerblue;
}
html.incoming {
  background-color: hotpink;
}
::view-transition {
  background-color: limegreen;
}
::view-transition-new(root) {
  transform: translateY(55vh);
  animation: none;
  opacity: 1;
}
::view-transition-old(root) {
  transform: translateY(-55vh);
  animation: none;
  opacity: 1;
}
::view-transition-group(root) {
  animation-duration: 300s;
}
</style>
<script>
const params = new URLSearchParams(location.search);
const uid = params.has('uid') ? params.get('uid') : token();
const ready_channel = new PrerenderChannel('ready-to-activate', uid);

if (!implementsSpeculationRules()) {
  onload = () => {
    document.body.innerText = 'This test requires speculation rules.';
    takeScreenshot();
  }
} else {
  if (!params.has('next')) {
    onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
  } else {
    onload = prerenderedPage;
  }
}

async function runTest() {
  document.documentElement.classList.add('outgoing');
  const next_url =
      new URL(`transition-to-prerender.html?next&uid=${uid}`, window.location).href;

  const ready_to_activate = new Promise(resolve => {
    ready_channel.addEventListener('message', resolve, {once: true});
  });

  startPrerendering(next_url);

  await ready_to_activate;

  window.location.replace(new URL(next_url, window.location));
}

function prerenderedPage() {
  document.addEventListener('prerenderingchange', () => {
    document.documentElement.classList.add('incoming');
    requestAnimationFrame(takeScreenshot);
  });

  ready_channel.postMessage('readyToActivateMessage');
  ready_channel.close();
}

function implementsSpeculationRules() {
  return ('supports' in HTMLScriptElement) &&
      HTMLScriptElement.supports('speculationrules');
}
</script>
</html>
chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/navigation/transition-to-prerender.html
