DOCTYPE - Document type declaration
Q1. What is document type declaration or DOCTYPE ? Ans. The <!DOCTYPE> declaration must be the first thing in your HTML document, before the <html> tag; it is an instruction to the web browser about what version of HTML the page is written in and also associates a particular SGML or XML document with a document type declaration (DTD). In the serialized form of the document, it manifests as a short string of markup that conforms to a particular syntax.