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Test Info:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script>
addEventListener("DOMContentLoaded", () => {
document.getElementById("input").setRangeText("A", 6, 134);
document.getElementById("center").replaceChild(
document.getElementById("label"),
document.getElementById("center").firstChild
);
document.designMode = "on";
document.execCommand("delete");
}, {once: true});
</script>
</head>
<body>
<h5>
AA
<ruby>
<rt hidden="">
<label>
</ruby>
<label id="label" contenteditable="true">
<input id="input" pattern="^\d+$">
</h5>
<center id="center">
</body>
</html>