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HTML: Document type declaration

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HTML » Document Structure — about 2 years ago
The<!DOCTYPE> is not a HTML tag. It is an instruction to 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 based on SGML (Standard Generalized Markup Language). So that the browsers render the content correctly.It is a top level tag known as a Public Text Identifier.HTML5 is not based on SGML so its not require any reference for DTD.For more visit the link.

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