ul>
            <li>
									         <a href="http://www.w3.org/QA/Tips/Doctype">Do
    					not forget to add a doctype by the W3C Quality Assurance Initiative
    					explains what doctypes are and why you should use them</a>. </li>
            <li>
									         <a href="http://www.w3.org/QA/2002/04/valid-dtd-list.html">Recommended
    						DTDs to use in your Web document by the W3C Quality Assurance Initiative
    						is a list of commonly used declarations</a>. </li>
            <li>
							