overview of Doctypes
HTML Doctype Overview
Doctypes - short for 'document type' - help browsers to understand the version of HTML the document is written in for better interpretability.
Doctype declarations are not HTML tags and belong at the very top of a document.
This topic explains the structure and declaration of various doctypes in HTML.
Adding the Doctype
The <!DOCTYPE> declaration should always be included at the top of the HTML document, before the <html> tag.
See HTML 5 Doctype for details on the HTML 5 Doctype.
HTML5 is not based on SGML (Standard Generalized Markup Language), and therefore does not require a reference to a DTD (Document Type Definition).
HTML 5 Doctype declaration:
Case Insensitivity Per the W3.org HTML 5 DOCTYPE Spec:
therefore the following DOCTYPEs are also valid:
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