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HTML 5 Programming and Web development/HTML 5 Doctype
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
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
<!DOCTYPE html>
<html>
<head>
</head>
<body>
</body>
</html>
The doctype must always be at the top of the document.
Document without doctype
Documents without doctype would work in most browsers ,but would not be classified as a valid document.(see Validation).