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<!DOCTYPE> tag tutorials

  • The <!DOCTYPE> Document Type Definition declaration must be the very first thing in your HTML document, before the <html> tag.

  • The <!DOCTYPE> declaration is not an HTML tag; it is an instruction to the web browser about what version of HTML the page is written in.

  • In HTML 4.01, the <!DOCTYPE> declaration refers to a DTD, because HTML 4.01 was based on SGML.

  • The DTD specifies the rules for the markup language, so that the browsers render the content correctly.

  • HTML5 is not based on SGML, and therefore does not require a reference to a DTD.



<!doctyple typename>






Example: HTML program to demonstrate doctype.

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