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Test Info:

<html>
<head>
<script>
document.addEventListener('DOMContentLoaded', () => {
const code = document.querySelector("code[contenteditable=false]");
// For emulating the traditional behavior, collapse Selection to end of the
// last text node in the <code> which is the last inline container of the
// <body>.
getSelection().collapse(code.lastChild, code.lastChild.length);
code.querySelector("br").contentEditable = true;
document.execCommand("indent");
});
</script>
<body>
<b contenteditable hidden>
<script></script>
<code contenteditable="false">
<br>
</body>
</head>
</html>