- Use color, but don't rely on color alone (e.g., don't say
"click on the red bar").
- Specify all colors for a color scheme. If only a background is
given it might be the same as user-specified defaults for a
foreground.
- Ensure sufficient contrast (for readability) when specifying
colors (including in images).
So, in HTML:
<body background=bg.gif>
becomes
<body background="bg.gif"
bgcolor="#8e0851" text="white"
link="3fa" vlink="5f5">
Related WCAG 1.0 checkpoints: 2.2.