File: iframe-domain-failure.sub.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>A test page that postMessage a SharedArrayBuffer to the parent and also sets document.domain</title>

<script>
"use strict";

document.domain = "{{host}}";
parent.postMessage({name: "domain", value: document.domain}, "*");
parent.postMessage(
  {name: "crossOriginIsolated", value: self.crossOriginIsolated}, "*");
parent.postMessage(new SharedArrayBuffer(10), "*");
</script>