> Basically, my purpose for sending this is to acquire
> more understanding of the purpose of the DTD. Is it
> there to set the rendering mode, or is it, as this
> support person purports, simply a formality?

Go to the source - W3C

<quote>
Why specify a doctype? Because it defines which version of (X)HTML your
document is actually using, and this is a critical piece of information
needed by browsers or other tools processing the document.

For example, specifying the doctype of your document allows you to use tools
such as the Markup Validator to check the syntax of your (X)HTML (and hence
discovers errors that may affect the way your page is rendered by various
browsers). Such tools won't be able to work if they do not know what kind of
document you are using.

But the most important thing is that with most families of browsers, a
doctype declaration will make a lot of guessing unnecessary, and will thus
trigger a "standard" parsing mode, where the understanding (and, as a
result, the display) of the document is not only faster, it is also
consistent and free of any bad surprise that documents without doctype will
create.
</quote>

Source: http://www.w3.org/QA/Tips/Doctype

Also worth a read is this:
http://www.alistapart.com/articles/doctype/

HTH
Russ


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