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HTML doctype

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The HTML !doctype tag is used for specifying which version of HTML the document is using. This is referred to as the document type declaration (DTD).

The HTML document type declaration starts off with <!doctype html public, followed information on the HTML specification that the document conforms to.

HTML 4.01 has 3 possible doctypes: HTML 4 Strict, HTML 4 Transitional, and HTML 4 Frameset. Every HTML document you create should have one of these three DTDs. The DTD you use will depend on how strict you want your HTML to be and whether you are using frames or not.

HTML 4 Strict

This document type includes all HTML elements except those that have been deprecated, and those that appear in frameset documents.

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

HTML 4 Transitional

This document type includes all HTML elements including those that have been deprecated.

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

HTML 4 Frameset

This document type includes all HTML elements in the transitional DTD as well as those in framed document.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd">

Also see the complete list of HTML tags


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