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<html>
<head>
<script>
function load() {
// Let the test page know that it can try to navigate.
top.postMessage("onload", "*");
// We're starting an infinite loop, but we need to time out after a
// while, or the loop will keep running until shutdown.
let t0 = performance.now();
while (performance.now() - t0 < 5000) {
document.getElementById("output").innerText = Math.random();
}
}
</script>
</head>
<body onload="load()">
<p id="output"></p>
</body>
</html>