<html style="font-family: Times New Roman; font-size: 13px;">
<body contenteditable="true" style="font-family: Arial; font-weight: bold;">This text should be Arial bold.</body>
<script>
document.body.focus();
document.execCommand("SelectAll");
document.execCommand("Underline");
document.execCommand("Copy");
window.getSelection().modify("move", "forward", "character");
document.execCommand("Paste");
</script>
</html>