Example

This code:

<html>
<head><title>Factorials</title></head>
<body>
<h2>Table of Factorials</h2>
<script>
<!--
var fact = 1;
for(i = 1; i < 10; i++) {
    fact = fact*i;
    document.write(i + "! = " + fact + "<br>");
}
-->
</script>
</body>
</html>

Looks like this.

Note that document.write does not work with XHTML.