HTML: !DOCTYPE

Specifies the HTML standard that should be used for this document.

Browser/User Agent Support

IE Netscape Mozilla Opera Safari
2.0+ 1.0+ 1.0+ 4.0+ 1.0+

IE	Netscape	Mozilla	Opera	Safari
2.0+	1.0+	1.0+	4.0+	1.0+

This example shows a !DOCTYPE element for a strict XHTML document:


			<!DOCTYPE "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" >

<!DOCTYPE /> is actually an XML element. Use this element as the first element in all XHTML documents.

W3C HTML 4.0