chromium/third_party/blink/web_tests/transitions/opacity-transform-transitions-inside-iframe.html

<html>
<!-- This test is minimal test case of crbug.com/324685. This test mimics Chrome Settings page. -->
<head>
  <style>
    iframe {
        border: none;
        display: block;
        height: 90%;
        width: 90%;
    }
  </style>
  <script>
    if (window.testRunner)
        testRunner.waitUntilDone();
    function testFinished()
    {
        if (window.testRunner)
            testRunner.notifyDone();
    }
    window.onmessage = function (messageEvent) {
        testFinished();
    }
  </script>
</head>
<body>
  <!-- The document inside iframe is not in force compositing mode, because iframe does not have overflow property. -->
  <div id="parent">
    <iframe id="iframe" src="resources/opacity-transform-transitions-inside-iframe-inner.html"></iframe>
  </div>
</body>
</html>