HTML doctype declaration - W3Schools
All HTML documents must start with a <!DOCTYPE> declaration. The declaration is not an HTML tag. It is an "information" to the browser about what document type to expect. In HTML 5, the declaration is …
Document type declaration - Wikipedia
A document type declaration, or DOCTYPE, is an instruction that associates a particular XML or SGML document (for example, a web page) with a document type definition (DTD) (for example, the formal …
Doctype - Glossary | MDN
Jul 11, 2025 · In HTML, the doctype is the required <!doctype html> preamble found at the top of all documents.
HTML: <!DOCTYPE> tag - TechOnTheNet
The HTML <!DOCTYPE> tag is the very first line in the HTML document. It tells the browser what version of HTML the document is written so that the browser knows what to expect.
HTML - Doctypes - DevTut
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. The <!DOCTYPE> declaration should …
HTML Document Type Declaration - W3Schools
The HTML5 doctype declaration is concise, easy to use, reliable, and case-insensitive. In HTML5, only the doctype declaration is required to enable standards mode for web pages.
Syntax of HTML5 Doctype Declaration - Tutorial Republic
A Document Type Declaration, or DOCTYPE for short, is an instruction to the web browser about the version of markup language in which a web page is written. A DOCTYPE declaration appears at the …
Declare the Doctype of an HTML Document - freeCodeCamp.org
You tell the browser this information by adding the <!DOCTYPE ...> tag on the first line, where the ... part is the version of HTML. For HTML5, you use <!DOCTYPE html>.
HTML <!DOCTYPE> Declaration - W3docs
The <!DOCTYPE> declaration specifies the HTML version used in the document. Learn how to use <!DOCTYPE> Declaration with with syntax and examples.
HTML DOCTYPE Declaration - GeeksforGeeks
Nov 1, 2025 · HTML DOCTYPE (Document Type Declaration) is an instruction that appears at the beginning of an HTML document, before the <html> tag. Its primary role is to tell the web browser …