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Chapter Six. XHTML: Restructuring the Web > Write All Tags in Lowercase

Write All Tags in Lowercase

Unlike HTML, XML is case sensitive. Thus, XHTML is case sensitive. All XHTML element and attribute names must be typed in lowercase, or your document will not validate. (Validation ensures that your pages are error free. Flip back to Chapter 5, “Modern Markup,” if you've forgotten about the free markup validation services offered by the W3C and the Web Design Group.)

Let's look at a typical HTML element:


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