When using CSS in APEX do you need to specify a DOCTYPE?

Hi
Have just started looking at creating my own CSS for APEX apps. Have read that for non-apex web pages that without a DOCTYPE being specified, browsers such as Mozilla & IE-6 go into Quirks mode, a backward compatibility feature that functions as if it has no knowledge of modern DOM.
Does this affect apex pages and do you need to specify a DOCTYPE?
regards
Tony

The built-in APEX HTML page templates don't include DOCTYPES, virtually all have table-based layouts, so whatever browser you bring along, they're gonna party like it's 1999 and everyone is down with Win IE5. This is due to DOCTYPE switching.
The main thing that working this way achieves is that Oracle avoid having to include additional CSS rules and abstruse hacks to deal with CSS rendering bugs in each and every browser out there. Some people think this is A Good Thing.
Web Standards are another Good Thing, and if properly implemented in each and every browser out there life as a web developer/designer would be a lot simpler. Including a DOCTYPE in your page is the starting point for standards-based development. You're declaring "this document is compliant with the stated version of (X)HTML". It's up to you to ensure that it is.
Using an incomplete DOCTYPE:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN">
proclaims your adherence to the XHTML 1.0 Strict standard, and you can take advantage of this by including a validator in your workflow to help you stick to it. However as it's incomplete, the browsers will still revert to rendering CSS in quirks mode, and using Javascript with a proprietary DOM.
A complete DOCTYPE:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"html://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
says that you truly believe it's 2008 and will make the browsers render CSS in standards mode, and work with the W3C standard DOM. This is when you may have to deal with browser-dependent rendering bugs. Which might make it seem that Web Standards are more trouble than they're worth, but if you stick to them you won't have any real trouble with getting sites to work with Firefox, Safari and Opera, maybe IE7 and possibly IE6. And you can take advantage of better CSS support in the first 4 of these to apply more advanced techniques.
So, you don't need a DOCTYPE in your APEX pages, but you can include one, and you have to if you want to do standards-based development (as seen here and here).
APEX doesn't (yet?) create 100% standards-compliant code [and sometimes neither do template developers; content creators almost never] but it has improved in this area version on version.

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When using CSS in APEX do you need to specify a DOCTYPE?

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