CSS and XSL
Style sheets are becoming increasingly important in HTML because, in HTML 4, many built-in style features such as the <CENTER> element have become deprecated (declared obsolete) in favor of style sheets. However, most HTML programming ignores style sheets entirely.
The story is different in XML because you create your own elements in XML. Thus, if you want a browser to display them, you have to tell it how. This is both good and bad: It's good because it enables you to use the powerful CSS and XSL specifications to customize the appearance of your XML elements far beyond what's possible with standard HTML. It's bad because it can demand a lot of additional work. (One way of getting around the necessity of designing your own style ...
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