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<!-- This document is used to report back to its parent (1) a message indicating
initial load, and (2) a message ACKing the result of moveBefore() being
called in the parent. It helps the parent test that this subframe was not
reloaded after moveBefore() is called on it -->
<!DOCTYPE html>
<body>
<script>
window.onload = e => {
window.onmessage = e => {
if (e.data === 'after moveBefore') {
window.parent.postMessage('ack after moveBefore', '*');
}
}
window.parent.postMessage('loaded', '*');
}
</script>
</body>