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 simply requires following a few simple rules. Also, XHTML code can be easily validated online so you can be sure it 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

more about these requirements

Here are some useful links from the Web site of the W³C (World Wide Web Consortium), the guiding body of the Web's development.

• W3C's XHTML validator
• W3C's CSS validator
• XHTML Resources
• CSS Resources

You can find more CSS related links at the Stylin' with CSS site.

© 2007 Charles Wyke-Smith