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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script>
"use strict";
addEventListener("DOMContentLoaded", () => {
document.querySelector("dialog").showModal();
document.getSelection().extend(document.querySelector("fieldset"), 0);
document.execCommand("insertHTML", false, "A");
}, {once: true});
</script>
</head>
<body>
<dialog contenteditable="true">
<fieldset id="b">
<!-- -->
</fieldset></dialog></body>
</html>