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’s this ability to make lots of small requests to the server on a

needs-basis that makes AJAX development so cool. Figure 1.2 shows an AJAX

application making asynchronous requests to a web server.

CSS (Cascading Style Sheets) provides a unified method for controlling the appearance

of user interface elements in your web application. You can use CSS to

change almost any aspect of the way the page looks, from font sizes, colors, and

spacing, to the positioning of elements.

In an AJAX application, one very good use of CSS is to provide user-interface

feedback (with CSS-driven animations and transitions), or to indicate portions

of the page with which the user can interact (with changes to color or appearance

triggered, for example, by mouseovers). For example, you can use CSS transitions

to indicate that some part of your application is waiting for an HTTP request

that

CSS manipulation figures heavily in the broader definition of the term AJAX

various visual transitions and effects, as well as in drag-and-drop and edit-in-place

functionality.
’s processing on the server.—in

Figure 1.1. A traditional web app is a synchronous system

An asynchronous car race would be a lot more exciting. The car in pole position

could be overtaken on the first corner, and the car that starts from the back of

the grid could weave its way through the field and cross the finish line in third

place. The HTTP requests from the browser in an AJAX application work in exactly

this way. It

Presentation: CSS

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