HTML 5 Programming and Web development/HTML 5 Doctype

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The HTML 5 Document Type Definition (Doctype) is used to identify the type of markup document. conventionally doctypes are written like this

<!doctype root-element PUBLIC [FPI] [URI]>

Where in this case the root-element would be HTML.FPI stands for formal public identifier. However in HTML 5 the Doctype is just written <!doctype html>

Example of doctype in HTML 5

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<!DOCTYPE html>

The doctype must always be at the top of the document.

Document without doctype

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Documents without doctype would work in most browsers ,but would not be classified as a valid document.(see Validation).