background-color-scroll-into-viewport.html

<!DOCTYPE html>
<html class="reftest-wait">
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#background-color">
<link rel="match" href="background-color-scroll-into-viewport-ref.html">
<style>
.container {
  width: 100vw;
  height: 100vh;
  overflow:  hidden;
  position:  relative;
}
.spacer {
  height: 1000vh;
}
#target {
  width:  50vw;
  height:  50vh;
  background-color: green;
  animation: bgcolor 1000000s cubic-bezier(0,1,1,0) -500000s;
}
@keyframes bgcolor {
  0% { background-color: rgb(0, 200, 0); }
  100% { background-color: rgb(200, 0, 0); }
}
</style>
<script src="/common/reftest-wait.js"></script>
<body>
  <div class="container">
    <div class="spacer"></div>
    <div id="target"></div>
  </div>
</body>
<script>
async function raf() {
  return new Promise((resolve) => {
    requestAnimationFrame(() => {
      resolve();
    });
  })
}

document.getAnimations()[0].ready.then(async () => {
  await raf();
  await raf();
  target.scrollIntoView();
  takeScreenshot();
});
</script>

</html>

chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/animations/background-color-scroll-into-viewport.html