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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
at the top of my page. What does this do functionally, and what other variations are there on this?
A valid HTML document declares what version of HTML is used in the document. The document type declaration names the document type definition (DTD) in use for the document
[w3.org...]
It explains how XHTML document must be defined (which is what the doc type does for you - defines what type of XHTML you are conforming to)
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3.1.1 Strictly Conforming Documents
A Strictly Conforming XHTML Document is a document that requires only the facilities described as mandatory in this specification. Such a document must meet all of the following criteria:
It must validate against one of the three DTDs found in Appendix A.
The root element of the document must be <html>.
The root element of the document must designate the XHTML namespace using the xmlns attribute [XMLNAMES]. The namespace for XHTML is defined to be [w3.org...]
There must be a DOCTYPE declaration in the document prior to the root element. The public identifier included in the DOCTYPE declaration must reference one of the three DTDs found in Appendix A using the respective Formal Public Identifier. The system identifier may be changed to reflect local system conventions.
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"DTD/xhtml1-strict.dtd">
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"DTD/xhtml1-transitional.dtd">
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
"DTD/xhtml1-frameset.dtd">
[msdn.microsoft.com...]
