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<!DOCTYPE html>
<iframe src="{{location[scheme]}}://{{domains[www2]}}:{{ports[http][0]}}{{location[path]}}/../Promise-incumbent-global-subsubframe.sub.html"></iframe>
<script>
document.domain = "{{host}}";
onmessage = function(e) {
if (e.data == "start") {
frames[0].Promise.resolve().then(frames[0].postMessage.bind(frames[0], "start", "*"));
} else {
parent.postMessage(e.data, "*");
}
}
</script>