chromium/third_party/blink/web_tests/external/wpt/css/css-masking/clip-path/animations/clip-path-animation-revert.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-none-ref.html">
<!--
  This test verifies that
  1) clip-path: revert in an animation does not cause a crash
  2) that clip-path: revert displays correctly for an animation
-->
<style>
  @keyframes clippath {
    0% {
      clip-path: inset(25% 25%);
    }

    100% {
      clip-path: revert;
    }
  }

  .target {
    animation: clippath 20s steps(2, jump-end) -9.999s;
    background-color: blue;
    width: 100px;
    height: 100px;
  }

  /*
   * Ensure that clip path is truly none, and not a rectangle that
   * encompasses area of the parent
   */
  .outofbounds {
    position: absolute;
    top: 200px;
    left: 200px;
    height: 10px;
    width: 10px;
    background-color: blue
  }
</style>
<script src="/common/reftest-wait.js"></script>
<script src="../../../../web-animations/resources/timing-utils.js"></script>

<body>
  <div class="target">
    <div class="outofbounds"></div>
  </div>
  <script>
    waitForAnimationTime(document.getAnimations()[0], 1).then(takeScreenshot);
  </script>
</body>

</html>