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HTML Document Types Definitions

A (DTD) Doctype is used to declare the type of Html or Xhtml markup the Web author is supposedly using in the document. HTML 4.01 specifies Three Doctype Definitions. Each vary in the elements they support, so web authors must include one of the following document type declarations in their Html documents (Webpages).

HTML 4.0 Transitional DTD


HTML 4.0 Strict DTD


HTML 4.0 Framrset DTD


HTML 4.01 Transitional DTD


HTML 4.01 Strict DTD


HTML 4.01 Frameset DTD


XHTML 1.0 Basic DTD


XHTML 1.0 Strict DTD With Name Space


XHTML 1.0 Transitional DTD


XHTML 1.0 Frameset DTD


New HTML5 Doctype