This is fascinating & really educational:
This site allows you to either use a sliding scale or put in hex codes to define #colour for both background and text, as well as determine text font size and thickness, and every combination is graded for #accessibility for people with #cataracts, #glaucoma, and various kinds of #ColourBlindness.
You can 'see' how that person would see your website.
A fail means that the #color combo offers some visual strain and should be avoided if possible.
WhoCanUse.com
