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World Wide Web Consortium (W3C) provides recommendations, specifications, and tools that will help with your web development projects.
You may be interested in the sections on HTML and XHTML, Cascading Style Sheets, and XML.
ou can also validate your HTML/XHTML and CSS to see if you are up to the standard mentioned in your DOCTYPE.
The first line of your HTML or XHTML document specifies the DOCTYPE (or "document type"). This is where you specify your document as a certain version of HTML (old school) or XHTML (new school).
If you are using HTML, you should easily be able to have your page validate as HTML 4.01 Transitional (or HTML 4.01 Frameset if you are using frames).
If you are using XHTML you should strive to make your pages validate as XHTML 1.0 Transitional. The XHTML 1.0 Strict standard is a bit too confining for real world web sites.
For more informstion about web standards and technologies, please see
World Wide Web Consortium
Web Standards Group
The Web Standards Project