What is < ! Doctype > in HTML 5?

What is < ! Doctype >in HTML 5?

The HTML document type declaration, also known as DOCTYPE, is the first line of code required in an HTML or XHTML document. The DOCTYPE declaration tells the web browser which version of HTML the page will be written to. This allows web pages to be parsed in different web browsers in the same way.

What is DOCTYPE?

Different types of software use Doctype for two purposes. Your web browser uses Doctype to determine which rendering mode to use (more on rendering methods later). The markup validator examines the document type to choose the rules for checking the document (later on).

Different types of software use Doctype for two purposes. Your web browser uses Doctype to determine which rendering mode to use (more on rendering methods later). The markup validator examines the document type to choose the rules for checking the document (later on).

The document type declaration (DOCTYPE for short) tells the web browser which version of the website's markup language is written in. The DOCTYPE declaration appears at the top of the web page before all other elements. According to the HTML specification or standard, every HTML document requires a valid document type declaration to ensure that the web page displays as intended. The doctype declaration is usually the first one defined in the HTML document (before the start tag). However, the doctype declaration itself is not an HTML tag.

The HTML5 DOCTYPE is very short, concise, and case-sensitive. Earlier HTML versions of Doctype have been lengthened because the HTML language is SGML-based and therefore requires a reference to the DTD but are now deprecated. In HTML5, this is no longer the case, and the doctype declaration is only needed to enable standard mode for documents written using HTML syntax.