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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 .
You’ve done all the right stuff, but your site doesn’t look or work as it should in the latest browsers. You’ve written valid XHTML and CSS. You’ve used the W3C standard Document Object Model (DOM) to manipulate dynamic page elements. Yet, in browsers designed to support these very standards, your site is failing. A faulty DOCTYPE is likely to blame.
W3C Recommendation 24 December 1999 This version: http://www.w3.org/TR/1999/REC-html401-19991224