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<!doctype html>
1
<script>
function f() {
opener.postMessage("original", "*");
if (opener.data.length >= 2) {
// If we proceed here, then our document.write will be racing with the
// setTimeout in our opener. Just stop.
return;
}
setTimeout(function () {
document.open();
document.write("<!doctype html>2<script>opener.postMessage('written', '*');<\/script>");
document.close();
});
}
window.onload = f
</script>