What is the ? Is it necessary in HTML5?

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What is the <!DOCTYPE>? Is it necessary  in HTML5?

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The andlt;!DOCTYPEandgt; is an instruction to web browser that tells what version of HTML the page is written in.And it does not have an end tag and It is not case sensitive.The andlt;!DOCTYPEandgt; declaration must be the very first thing in HTML5 document, before the andlt;htmlandgt; tag. As In HTML 4.01, all andlt;! DOCTYPE andgt; declarations require a reference to a Document Type Definition , because HTML 4.01 was based on Standard Generalized Markup Language (SGML). WHERE AS HTML5 is not based on SGML, and therefore does not require a reference to a Document Type Definition (DTD).

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What is the <!DOCTYPE>? Is it necessary in HTML5?

Anonymous User

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