An XHTML document can be validated with W3C's validator.
Before an XHTML file can be validated, a correct DTD must be added as the first line of the
The Strict DTD includes elements and attributes that have not been deprecated or do not appear in
The Transitional DTD includes everything in the strict DTD plus deprecated elements and
The Frameset DTD includes everything in the transitional DTD plus frames as well:
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