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<!doctype html>
<h2>Child Frame</h2>
<script>
onload = () => {
let count = 0;
const loop = () => {
if (++count < 10) {
requestIdleCallback(loop);
} else {
const target = location.href.replace('www1.', '')
.replace('resources/child.html', '');
window.parent.postMessage('done', target);
}
};
requestIdleCallback(loop);
}
</script>