<!DOCTYPE> tag HTML

A simple <!DOCTYPE> tag:

<!DOCTYPE html>
<html>
<body>
	<p>We use the !DOCTYPE tag to start all HTML documents</p>
</body>
</html>

Laboratory

description & Usage

In order for browsers to understand what type of document to expect, we need to use a <!DOCTYPE> declaration.

A document can have various types, for example:

<!DOCTYPE html>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

Note: HTML documents must start with a <!DOCTYPE> declaration.

Note: This declaration must be placed at the top of the page before the <html> tag.

Note: Remember <!DOCTYPE> is a declaration and not a tag.

Note: The declaration is case-insensitive:

<!DOCTYPE html>
<!DocType html>
<!Doctype html>
<!doctype html>

#	Chrome	Edge	Firefox	Safari	Opera
<!DOCTYPE>