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Receptional_Andy - 9:57 pm on Apr 22, 2008 (gmt 0)
They also suggest an algorithm to determine appropriate colour contrast [w3.org]. There are various implementations of this around the web and within accessibility software. Indeed, most discussion I've found about correct colour contrast seems to stem entirely from those two documents. Now, if I have a design that does not currently meet these criteria, I can only think of two workable choices:
According to the WAI: Ensure that foreground and background color combinations provide sufficient contrast when viewed by someone having color deficits or when viewed on a black and white screen. [Priority 2 for images, Priority 3 for text]
Checkpoint 2.2 [w3.org]
Unlike text size where there seem to be a whole host of methods to improve viewing, colour seems to be only easily adjustable to those with user stylesheets. Perhaps there are other mechanisms I'm not aware of.
There are a few other aspects such as text that passes the algo as long as text size is large enough, but I assume that it would be unwise to rely on users resizing fonts for legibility. or is it?
Aside from acccessibility, contrast and legibility are clearly usability concerns too. I've disabled CSS or page colours on many sites in my time ;)
Any comments/thoughts/pointers?