gecko-dev/dom/canvas/test/test_drawWindow.html

<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <title>Test for canvas drawWindow</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="application/javascript" src="/tests/SimpleTest/WindowSnapshot.js"></script>
  <script type="application/javascript" src="file_drawWindow_common.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
  <script type="application/javascript">

  SimpleTest.waitForExplicitFinish();
  window.addEventListener("load", openSourceWindow, false);

  var sourceWindow;

  function openSourceWindow(event) {
    if (event.target != document) {
      return;
    }

    sourceWindow = window.open("file_drawWindow_source.html", "",
                               "width=200,height=100");
    sourceWindow.addEventListener("load", runTests, false);
  }

  function runTests(event) {
    if (event.target != sourceWindow.document) {
      return;
    }

    // Run the tests with the source document in an <iframe> within this
    // page, which we expect to have transparency.
    runDrawWindowTests(document.getElementById("source").contentWindow,
                       0, true);

    // Run the tests on the same source document, but in a window opened
    // by window.open.  We do not expect this to have transparency...
    // except on B2G.  (This is *probably* a bug in B2G.)
    var isB2G = /Mobile|Tablet/.test(navigator.userAgent) &&
                !navigator.userAgent.contains("Android");
    runDrawWindowTests(sourceWindow, 0, isB2G);

    sourceWindow.close();

    SimpleTest.finish();
  }

  </script>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=">Mozilla Bug </a>
<iframe id="source" src="file_drawWindow_source.html" width="200" height="100"></iframe>
</body>
</html>