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The definition of the DOCTYPE in HTML reachs usage

September 29, 2007 at 3:50 am · Filed under Web Design

It is quotative content below:

The < ! DOCTYPE>Declaration Is The Very First Thing In Your Document, before The <html>Tag. This Tag Tells The Browser Which HTML Or XHTML Specification The Document Uses.

Note: The < ! DOCTYPE>Tag Does Not Have An End Tag!

HTML
HTML 4.01 Specifies Three Document Types: Strict, transitional, and Frameset.

HTML Strict DTD

Use This When You Want Clean Markup, free Of Presentational Clutter. Use This Together With Cascading Style Sheets (CSS) :

< ! DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01//EN” “http://www.w3.org/TR/html4/strict.dtd “>
HTML Transitional DTD

The Transitional DTD Includes Presentation Attributes And Elements That W3C Expects To Move To A Style Sheet. Use This When You Need To Use HTML’s Presentational Features Because Your Readers Don’t Have Browsers That Support Cascading Style Sheets (CSS) :

< ! DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN” “http://www.w3.org/TR/html4/loose.dtd “>
Frameset DTD
The Frameset DTD Should Be Used For Documents With Frames. The Frameset DTD Is Equal To The Transitional DTD Except For The Frameset Element Replaces The Body Element:

< ! DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Frameset//EN” “http://www.w3.org/TR/html4/frameset.dtd “>
XHTML
XHTML 1.0 Specifies Three XML Document Types: Strict, transitional, and Frameset.

XHTML Strict DTD

Use This DTD When You Want Clean Markup, free Of Presentational Clutter. Use This Together With Cascading Style Sheets (CSS) :

< ! DOCTYPE Html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" >
XHTML Transitional DTD

Use This DTD When You Need To Use XHTML’s Presentational Features Because Your Readers Don’t Have Browsers That Support Cascading Style Sheets (CSS) :

< ! DOCTYPE Html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
XHTML Frameset DTD

Use This DTD When You Want To Use Frames!

< ! DOCTYPE Html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd" >
To Check That You Have Written A Valid XHTML Document With A Correct DTD, you Can Link Your XHTML Page To An XHTML Validator.

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