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<!DOCTYPE html>
<script>
function secondScriptRan() {
parent.postMessage("done", "*");
}
function createSecondScript() {
var script = document.createElement("script");
script.src = "data:application/javascript,secondScriptRan()";
document.head.appendChild(script);
var xhr = new XMLHttpRequest();
xhr.open("GET", "data:,", false);
xhr.send();
}
</script>
<script src="data:application/javascript,createSecondScript()" defer></script>