Codebase Browser
chromium
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chromium/third_party/blink/web_tests/http/tests/devtools/tracing/resources/timeline-iframe-data.html 

<html>
<head>
<script>
console.timeStamp("SCRIPT TAG");

function iframeOnload()
{
    console.log("iframe loaded");
}
</script>
</head>

<body onload="iframeOnload()">
    <div>Foo</div>
</body>

</html>