background-color-transition-obscured.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-transition-obscured-ref.html">
<style>
.parent {
  width: 100px;
  height: 100px;
  background-color: rgb(0, 200, 0);
  transition: background-color 200000ms steps(2) -99999.9ms;
}
.container {
  width: 100px;
  height: 100px;
  background-color: rgb(0, 0, 200);
  transition: background-color 200000ms steps(2) -99999.9ms;
}
</style>
<script src="/common/reftest-wait.js"></script>
<body>
<div class="parent" id="pa">
  <div class="container" id="target"></div>
</div>

<script>
function startTransition() {
  requestAnimationFrame(() => {
    document.getElementById('target').style.backgroundColor = "rgb(200, 0, 0)";
    document.getElementById('pa').style.backgroundColor = "rgb(200, 0, 0)";
    const animations = document.getAnimations();
    Promise.all([animations[0].ready, animations[1].ready]).then(() => {
      requestAnimationFrame(() => {
        requestAnimationFrame(() => {
          takeScreenshot();
        });
      });
    });
  });
}

requestAnimationFrame(startTransition);
</script>
</body>
</html>

chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/animations/invalidation/background-color-transition-obscured.html