Don't Use Color For Meaning

Color does not always convey meaning for all users. In the following example, you can see an example of a list on a website as seen through the eyes of someone that has a red-green color deficiency (a common form of "color blindness"):

Pick out the animals in RED

  • Bird
  • Cat
  • Dog
  • Horse

In this example, while bird and dog are red, cat is actually green. So as you can see, the color doesn't convey the correct meaning to site visitors with a pretty common color deficiency, let alone students who are otherwise visually impaired. A better solution for the example above that works for all users would be to mark the words like this:

Pick out the animals in RED*

  • Bird*
  • Cat
  • Dog*
  • Horse^