@violetto : There are no color contrast requirements at A level.
Jan 26 2016
Dec 15 2015
Sep 29 2015
You managed to find a mistake in the W3C's website, well done ! ;-)
Sep 24 2015
Regarding color contrast. Originally the criteria to achieve AA success required more contrast than it does now. If I'm not mistaken, the minimum criteria was lowered because it was too difficult to apply in most situations. The color palette that designers were left with was too restrained.
@violetto : Regarding the priorities for AA and AAA, I think the best answer comes from the W3C.
Sep 18 2015
Have you taken into account people with photophobia ? These people need light colors for the text, and dark background. But no pure white or anything too bright.