Blitz - WPT: view-transition-waituntil-animation-manipulation.html

wpt / css / css-view-transitions / view-transition-waituntil-animation-manipulation.html

/css/css-view-transitions/view-transition-waituntil-animation-manipulation.html

<!DOCTYPE html>
<html class=reftest-wait>
<title>View transitions: waitUntil allows animation manipulation</title>
<link rel="help" href="https://www.w3.org/TR/css-view-transitions-1/">
<link rel="author" href="mailto:vmpstr@chromium.org">
<link rel="match" href="view-transition-waituntil-animation-manipulation-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>
:root { view-transition-name: none }

#target {
  width: 100px;
  height: 100px;
  background: green;
  view-transition-name: target;
}

#target.after {
  background: red;
}

::view-transition { background: lightpink; }
::view-transition-group(*) {
  animation-duration: 1ms;
}
</style>

<div id=target></div>

<script>
failIfNot(document.startViewTransition, "Missing document.startViewTransition");
failIfNot(ViewTransition.prototype.waitUntil, "ViewTransition.waitUntil is not available");

async function runTest() {
  const transition = document.startViewTransition(() => target.classList.add("after"));
  transition.waitUntil(new Promise(() => {}));

  transition.ready.then(async () => {
    // Let the animation run to the end.
    const animations = document.getAnimations();
    animations.forEach(a => {
      a.currentTime = 1;
    });

    // Wait a few frames.
    await new Promise(requestAnimationFrame);
    await new Promise(requestAnimationFrame);
    await new Promise(requestAnimationFrame);

    // Now, rewind the animation and take a screenshot.
    requestAnimationFrame(() => {
      animations.forEach(a => {
        a.play();
        a.pause();
        a.currentTime = 0;
      });
      takeScreenshot();
    });
  });
}
onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
</script>

/css/css-view-transitions/view-transition-waituntil-animation-manipulation-ref.html

<!DOCTYPE html>
<title>View transitions: waitUntil allows animation manipulation (reference)</title>
<link rel="help" href="https://www.w3.org/TR/css-view-transitions-1/">
<link rel="author" href="mailto:vmpstr@chromium.org">
<style>
body {
  background: lightpink;
}
.target {
  width: 100px;
  height: 100px;
  background: green;
}
</style>

<div class=target></div>