<!DOCTYPE html>
tag
HTML5
Declares the document type and HTML version. Must be the very first line in every HTML document.
Syntax
<!DOCTYPE html>
Example
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>My Page</title>
</head>
<body>
<p>Hello World</p>
</body>
</html>