chromium/third_party/blink/web_tests/http/tests/plugins/resources/navigator-plugins-frame.html

<html>
<head>
<script src="navigator-plugins.js"></script>
<script>

function sendPluginData() {
    parent.postMessage(pluginDataAsString(), "*");
}

</script>
<body onload="sendPluginData()">
This frame evaluates navigator.plugins and navigator.mimeTypes and sends results
to the parent frame.
</body>
</html>