chromium/third_party/blink/web_tests/ppapi/plugins/plugin-paint-test.html

<!DOCTYPE html>
<html>
<head>
  <script src="../../resources/js-test.js"></script>
  <script>
    jsTestIsAsync = true;
    description('This tests that dynamically added plugins receive paint events on creation.');
    function onLoad()
    {
      var pluginDiv = document.querySelector('#pluginDiv');
      // Create the plugin in the middle of the page.
      pluginDiv.innerHTML = '<embed id="testPlugin" type="application/x-blink-test-plugin" width="200" height="200"></embed>';
      document.querySelector('embed').addEventListener('message', onPluginMessage);
    }

    function onPluginMessage(message)
    {
      testPassed('plugin message: ' + message.data);
      if (message.data == 'loaded')
        finishJSTest();
    }
  </script>
</head>
<body onload="onLoad()">
  <div id="pluginDiv" style="position: absolute; left: 300px; top: 300px; height: 400px; width: 400px; padding: 1em;">
  </div>
</body>
</html>