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Test Info:

<head>
<meta charset="utf-8">
<script>
addEventListener("DOMContentLoaded", () => {
document.execCommand("selectAll");
document.designMode = "on";
document.execCommand("insertHorizontalRule");
});
</script>
</head>
<body>
<audio></audio>
<ins contenteditable>
<q dir="ltr">
<button>A</button>
<dialog dir="rtl" open>
<canvas></canvas>
<fieldset>
<!-- The following white-space is important -->
</fieldset></dialog></q></ins></body>
</html>