Chapter 9. CSS modification
In fact, seven of the example scripts use some form of CSS modification. For instance, Form Validation changes the styles of the incorrect form field, and XMLHTTP Speed Meter uses animations (i.e., many changes to the same style in a short time) to draw the eye of the user to the speed data. (Also, to be honest, as a bit of eye candy.) Dropdown Menu uses style changes to show and hide menu items. These changes all have the same purpose: to draw the eye of the user to these elements.