To make text italic using JavaScript, use the italics() method. This method causes a string to be italic as if it were in an <i> tag.
Example
You can try to run the following code to make a text italic with JavaScript −
<html>
<head>
<title>JavaScript String italics() Method</title>
</head>
<body>
<script>
var str = new String("Demo Text");
document.write(str.italics());
alert(str.italics());
</script>
</body>
</html>