clip-path-animation-ensure-keyframe-update.html

<!DOCTYPE html>
<html class="reftest-wait">
<link rel="help" href="https://drafts.csswg.org/css-shapes-1/#basic-shape-interpolation">
<link rel="match" href="clip-path-animation-ref.html">
<style>
  .container {
    width: 100px;
    height: 100px;
    background-color: green;
    animation: clippath 20s steps(1) -9.999s;
  }

  @keyframes clippath {
    0% {
      clip-path: circle(50% at 50% 50%);
    }

    50% {
      clip-path: circle(35% at 35% 35%);
    }

    100% {
      clip-path: circle(20% at 20% 20%);
    }
  }
</style>
<script src="/common/reftest-wait.js"></script>
<script src="../../../../web-animations/resources/timing-utils.js"></script>

<body>
  <div class="container"></div>

  <script>
    waitForAnimationTime(document.getAnimations()[0], 1).then(takeScreenshot);
  </script>
</body>

</html>

chromium/third_party/blink/web_tests/external/wpt/css/css-masking/clip-path/animations/clip-path-animation-ensure-keyframe-update.html