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<!DOCTYPE html>
<meta charset="utf-8">
<title>This page will attempt to access the frameElement of its sibling and report the results on request</title>
<h1>I did get loaded</h1>
<script>
"use strict";
window.onmessage = e => {
const { newDocumentDomain } = e.data;
if (newDocumentDomain) {
document.domain = newDocumentDomain;
}
const siblingWindow = parent.frames[0];
try {
const { frameElement } = siblingWindow;
let result = "something wierd happened";
if (frameElement === null) {
result = "null";
} else if (frameElement.constructor) {
result = frameElement.constructor.name;
}
parent.postMessage(result, "*");
} catch (e) {
parent.postMessage(e.name, "*");
}
};
</script>