What JavaScript Can Do
There are many things that you can do with JavaScript to make your Web pages more interactive and provide your site’s users with a better, more exciting experience. JavaScript lets you create an active user interface, giving the users feedback as they navigate your pages. For example, you’ve probably seen sites that have buttons that highlight as you move the mouse pointer over them. That’s done with JavaScript, using a technique called a rollover (Figure 1.2).
Figure 1.2. A rollover is an image that changes when you move the mouse pointer over it.
You can use JavaScript to make sure that your users enter valid information ...
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