Thefreecountry.com: Free Programmers' Resources, Free Webmasters' Resources, Free Security Resources. W3Schools Online Web Tutorials. C QA - Recommended list of Doctype declarations you can use in your Web document.
Warning The list is informative and does not try to be exhaustive (there are many other proper declarations you could use), but it has most of the declarations commonly used on the Web at the moment.
Recommended Doctype Declarations to use in your Web document. When authoring document is HTML or XHTML, it is important to Add a Doctype declaration. The doctype declaration must be exact (both in spelling and in case) to have the desired effect, which makes it sometimes difficult. To ease the work, below is a list of recommended doctype declarations that you can use in your Web documents. Template Use the following markup as a template to create a new XHTML 1.0 document using a proper Doctype declaration. <! (X)HTML Doctype Declarations List Strict Transitional Frameset Strict (quick reference) Transitional Frameset XHTML Basic 1.1 (quick reference): HTML 5 [NOT a standard yet] MathML Doctype Declarations MathML 2.0 - DTD: MathML 1.01 - DTD: Compound documents doctype declarations SVG 1.1 Full - DTD: