THE WEB STANDARDS GROUP RECOMMENDS a
doctype of XHTML 1.0 Transitional in all Web pages AND validation
to that standard.
The doctype tells a validator which version of HTML to use in
checking the document's syntax. Here's how the Web Design Group
describes XHTML 1.0 Transitional:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">
This declares the document to be XHTML 1.0 Transitional. XHTML
1.0 Transitional is an XML version of HTML 4 Transitional...
HTML 4 Transitional includes all elements and attributes
of HTML 4 Strict but adds presentational attributes, deprecated
elements, and link targets. HTML 4 Transitional recognizes
the relatively poor browser support for style sheets, allowing
many HTML presentation features to be used as a transition
towards HTML 4 Strict. - from Web
Design Group
To name the doctype, the first line of the document looks like
this:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">
WSG recommends validation to XHTML 1.0 Transitional and CSS
2.1. W3C provides free validators that check HTML and XHTML documents:
http://validator.w3.org/
http://jigsaw.w3.org/css-validator/
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