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DOCTYPES:  HTML 4.01 specifies Three Types of Doctype Definitions. Each DTD vary in the elements they support, so authors must include one of the following document type declarations in their documents.

XHTML 1.0 Strict Doctype


HTML 4.0 Strict Doctype


XHTML 1.0 Transitional Doctype


HTML 4.0 Transitional Doctype


XHTML 1.0 Frameset Doctype