HTML <!doctype> Tag
The Hypertext Mark-up Language tag is employed for specifying that version of hypertext mark-up language the document is victimization. this is often observed because of the document sort declaration (DTD).
NOTE:− The Tag Doesn’t Have An Associate Finish Tag!.
Example:-
<!DOCTYPE html>
<html>
<head>
<title>HTML doctype Tag</title>
</head>
<body>
<h1>HTML < !doctype > tag</h1>
<p>doctype declaration <doctype> is mentioned at the starting of
every HTML document.</p>
</body>
</html>Output:-
HTML < !doctype > tag
doctype declaration