File: clip-path-animation-custom-property.html

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<!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-custom-property-ref.html">
<style>
  * {
    --small: inset(10px 10px);
    --large: inset(30px 30px);
  }

  @property --large {
    syntax: "<basic-shape>";
    inherits: true;
    initial-value: inset(10px 10px);
  }

  @property --small {
    syntax: "<basic-shape>";
    inherits: true;
    initial-value: inset(30px 30px);
  }

  @keyframes clippath {
    0% {
      clip-path: var(--small);
    }

    100% {
      clip-path: var(--large);
    }
  }

  .background {
    width: 200px;
    height: 200px;
    background-color: blue;
    animation: clippath 20s steps(2, jump-both) -10s;
  }

  .background.circularize {
    --small: circle(10% at 50% 50%);
    --large: circle(40% at 50% 50%);
  }
</style>
<script src="/common/reftest-wait.js"></script>
<script src="/web-animations/testcommon.js"></script>

<body>
  <div id="anim" class="background"></div>

  <script>
    document.getAnimations()[0].ready.then(() => {
      document.getElementById("anim").classList.add("circularize");
      waitForAnimationFrames(3).then(takeScreenshot);
    });
  </script>
</body>

</html>