XHTML Validation
An XHTML document can be validated with W3C's validator.
Validate XHTML With A DTD
Before an XHTML file can be 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"
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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"
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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"
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