Doctype
In HTML, the <!DOCTYPE>
declaration, often referred to as the doctype declaration, is not a tag but rather an instruction that specifies the version of HTML (or XHTML) used in a document. It must appear at the very beginning of an HTML document, before any other content, including the <html>
tag.
The purpose of the <!DOCTYPE>
declaration is to inform web browsers and other parsers about the version of HTML being used in the document, as well as the document type definition (DTD) that describes the structure and syntax rules for that version of HTML. This helps ensure that the document is parsed and rendered correctly by browsers and other tools.
(ChatGPT, February 23, 2024)