<!DOCTYPE html>
<html>
<body>
<script>

onload = top.postMessage({'type': 'load'}, '*');
onmessage = (event) => {
    if (event.data.type != 'run')
        return;

    let number = event.data.startingNumber;
    let logs = [];
    for (const frameName of event.data.order) {
        const windowProxy = frameName == 'self' ? self : top[frameName];
        windowProxy.internals.queueTask("DOMManipulation", () => logs.push(number++));
    }

    setTimeout(() => {
        top.postMessage({'type': 'logs', logs}, '*');
    }, 20);
}

</script>
</body>
</html>