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<html>
<body>
<template>
<p>template content</p>
</template>
<div></div>
<script>
"use strict";
const template = document.querySelector("template");
const clone = document.importNode(template.content, true);
document.querySelector("div").appendChild(clone);
window.opener.postMessage("ready", "*");
</script>
</body>
</html>