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Valid DOCTYPEs

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

"http://www.w3.org/TR/html4/loose.dtd">

This is the "transitional" definition. You're telling the browser that you want to use HTML 4.01 standards to render the document, but that you may decide to slip in some deprecated tags for formatting instead of using only CSS for presentation. Deprecated tags are those that are marked for deletion in future versions of HTML/XHTML.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN"

"http://www.w3.org/TR/html4/frameset.dtd">

The "frameset" mode also lets you use deprecated tags like FONT and CENTER and it adds the necessary support to help the browser render the frameset correctly.