Color

Color is useful to enhance, emphasize, or reiterate information. To ensure that color works for users, you should follow these guidelines:

Avoid conveying information by color alone or provide an option to convey the information also using text or graphics.
When screen elements correspond with standard elements, use the system colors chosen in Control Panel.
When screen elements do not correspond with elements in Control Panel, allow the user to customize the colors.
Make sure graphic objects are drawn to contrast with the current background color.
If you display complex backgrounds behind text or objects, allow the user to select a plain background.
If you use private colors or complex backgrounds, omit them when the High Contrast Mode flag is set.