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. . . . . . . . . . . 408
Chapter 18 Differences Between HTML and
XHTML . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 409
MIME Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411
Case Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412
Optional Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
Root Element Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
Appendix A Alphabetic Property Index . . . . . . . . . . 417
The Ultimate CSS Reference xiv
Chapter 1 What Is CSS?
What Is CSS?
Have you ever thought about what a web page is? I mean, what it really is? Some
people think of a web page as a visual medium??”an aesthetically pleasing experience
which may or may not contain information that??™s of interest to the viewer. Other
people think of a web page as a document that may be presented to readers in an
aesthetically pleasing way.


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