Use More than Color Alone to Convey Information in a Web Page
We should not use color alone as the only visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element. Users may not be able to see/understand the differences in color and require additional indicators.
Along with color, use additional indicators such as:
- typography
- shapes
- grids
- spaces
- and/or allocate more weight to important elements
References:
- http://www.particletree.com/features/interfaces-and-color-blindness/
- https://www.smashingmagazine.com/2014/10/color-contrast-tips-and-tools-for-accessibility/