Chapter 9. CSS modification

JavaScript allows you to modify the CSS presentation layer of your site. A style change is an excellent (and very common) way to draw your users’ eyes to the page element on which you want them to focus.

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.

JavaScript can modify CSS in four ...

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