13 Oct HTML <!DOCTYPE> Declaration
The HTML <!DOCTYPE> isn’t a tag, it’s a declaration. It is the first think you can see on any HTML Document. Add the doctype declaration to HTML Document, since it is an instruction to the browser. The instruction is to tell the browser which HTML version to expect.
The following is an example showing doctype declaration in HTML,
The following example shows how to correctly add <!DOCTYPE> to an HTML web page,
Here’s the output,