HTML - <doctype> Tag

Description

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).

NOTE − The <!DOCTYPE> tag does not have an end tag!.

Example

Live Demo

<!DOCTYPE html>
<html>

   <head>
      <title>HTML doctype Tag</title>
   </head>

   <body>
      <p>doctype declaration <doctype> is mentioned at the starting of
         every HTML document.</p>
   </body>
</html>

This will produce the following result −

Declaration

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.

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">

HTML 5 Declaration

In HTML5 there is only one declaration i.e.

<!DOCTYPE html>

Browser Support

Chrome	Firefox	IE	Opera	Safari	Android
Yes	Yes	Yes	Yes	Yes	Yes

html_tags_reference.htm

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