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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<iframe id="iframe"></iframe>
<script type="text/javascript">
"use strict";
addEventListener("load", () => {
let iframe = document.getElementById("iframe");
let doc = iframe.contentDocument;
doc.open("text/html");
doc.write("Hello.");
doc.close();
}, {once: true});
</script>
</body>
</html>