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HTML DOCTYPE TutorialThe DOCTYPE declaration should be the first thing in an HTML document, even before the opening <html> tag.
The DOCTYPE declaration simply informs web browsers which mark-up language and which version of the markup language the page is written in.
The DOCTYPE declaration refers to a Document Type Definition, or DTD for short. The DTD specifies the rules for the markup language so browsers can render the content according to established standards.
DOCTYPE DeclarationsBelow are the DOCTYPE declarations recommended by the W3C.
HTML 4.01 Strict
The above DTD contains all the standard HTML elements and attributes, but does not include deprecated elements. Framesets are not allowed with this DTD. Framesets have their own DTD which is listed further below.
HTML 4.01 Transitional
The above DTD contains all the standard HTML elements and attributes, including presentational and deprecated elements. This is probably the most comment DTD in use and the one I recommend for most webmasters. Framesets are not allowed with this DTD. Framesets have their own DTD which is listed further below.
HTML 4.01 Frameset
The above DTD is for use with framesets.
This concludes the HTML DOCTYPE Tutorial.
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