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Test Info:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script>
addEventListener("load", () => {
const samp = document.createElement("samp");
samp.innerText = "ABC";
samp.contentEditable = true;
document.documentElement.appendChild(samp);
getSelection().selectAllChildren(samp);
document.execCommand("indent");
});
</script>
</head>
<body>
</body>
</html>