Question - What's XHTML Validation?
Answer -
An XHTML document is validated against a Document Type Definition.
Validate XHTML With A DTD
An XHTML document is validated against a Document Type Definition (DTD). Before an XHTML file can be properly validated, a correct DTD must be added as the first line of the file.
The Strict DTD includes elements and attributes that have not been deprecated or do not appear in framesets:
!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
The Transitional DTD includes everything in the strict DTD plus deprecated elements and attributes:
!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
The Frameset DTD includes everything in the transitional DTD plus frames as well:
!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Frameset//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd"
This is a simple XHTML document:
simple document
a simple paragraph
Ampersands in hrefs must convert "&" to "&" in the URI
Sample List
becomes
Sample List
# The attribute "name" becomes "id" when used for a locator inside a document
For example, to reference a section within a document with a URI, we usually do something like
"