[crazygringo]

Are you saying such a plugin exists that only works with named colors?

That would seem like a... usability disaster.

Any accessibility tool for vision should operate at an OS level to map colors across everything. And even if you wanted a web-only tool, it would need to similarly operate across all colors -- whether hex codes or in images or SVG's. Very few sites use any named CSS colors at all except for "white" or "black".

There are lots of areas where it's important to keep accessibility in mind... but named CSS colors would not seem to be one of them.

[kall]

For contrast, css can be quite effective. A brute force background black, text white, link yellow has served me very well. For color blindness correction an OS level filter is the way to go.