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a New Riders book by Charles Wyke-Smith

Welcome to XHTML

Good XHTML markup makes your content portable,
accessible and future-proof. Creating XHTML-compliant pages
requires following a few simple rules. Also, XHTML code
can be easily validated online so you can ensure your code
is correctly written.

Here are the key requirements for successful validation
of your XHTML code.

1. Declare a DOCTYPE


2. Declare an XML namespace


3. Declare your content type


4. Close every tag, enclosing or non-enclosing


5. All tags must be nested correctly


6. Inline tags can't contain block level tags


7. Write tags in lowercase


8. Attributes must have values and must be quoted


9. Use encoded equivalents for left brace and
   ampersand

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