1. Add a <!DOCTYPE> :
Add an XHTML <!DOCTYPE> to the first line of every page.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2. Add an xmlns Attribute :
Add an xmlns attribute to the html element of every page.
<html xmlns="http://www.w3.org/1999/xhtml">
3. Change Tags And Attribute Names to Lowercase :
Replace all uppercase tags and attributes with lowercase tags and attributes respectively.
4. Quote All Attribute Values :
In every page, make sure that attribute values are quoted.
5. Close all Empty Tags :
Empty tags are not allowed in XHTML. The <hr> and <br> tags should be replaced with <hr /> and <br/>.
6. Validate XHTML With The W3C Validator :
Before an XHTML file can be validated, a correct DTD must be added as the first line of the file. Validate the document by url here, http://validator.w3.org/ .
Correct errors if any found.
<< HTML Advanced tutorial 30 : XHTML Doctypes
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