File: transition-in-empty-iframe.html

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<!DOCTYPE html>
<html class=reftest-wait>
<head>
  <title>View transitions: Transition from an empty iframe</title>
  <link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
  <link rel="author" href="mailto:bokan@chromium.org">
  <link rel="match" href="transition-in-empty-iframe-ref.html">
  <meta name=fuzzy content="maxDifference=0-80; totalPixels=0-1000">
  <script src="/common/reftest-wait.js"></script>
  <style>
    iframe {
      position: absolute;
      left: 25px;
      top: 25px;
      width: 50vw;
      height: 50vh;
    }
    /* This div overlaps with the iframe, because the iframe is empty it should
     * be visible behind the iframe. */
    div {
      background-color: skyblue;
      width: 100px;
      height: 100px;
    }
  </style>
  <script>
    failIfNot(document.startViewTransition, "Missing document.startViewTransition");

    onload = () => {
      requestAnimationFrame(()=>{requestAnimationFrame(()=> {
        frames[0].window.startTransition();
        frames[0].window.transition.ready.then(() => {
          requestAnimationFrame(()=>{requestAnimationFrame(()=> {
            takeScreenshot();
          })});
        });
      })});
    }
  </script>
</head>

<body>
  <iframe src="support/transition-in-empty-iframe-child.html">
  </iframe>
  <div></div>
</body>
</html>