Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/fast/loader/resources/subframe-notify-done.html 

<html>
<head>
<script>
function loaded() {
    if (window.testRunner) {
        testRunner.notifyDone();
    }
}
</script>
</head>
<body onload="loaded();">
I am a simple document that calls notifyDone() when loaded
</body>
</html>