Use the JavaScript fixed() method to display in fixed-pitch font as if it were in a <tt> tag.
Example
You can try to run the following code to display a string in the fixed-pitch font.
<html>
<head>
<title>JavaScript String fixed() Method</title>
</head>
<body>
<script>
var str = new String("Hello world");
alert(str.fixed());
</script>
</body>
</html>