HomeCheckpoint 9.1 - Core
All foreground and background colours in text have sufficient contrast
WCAG 1.0 Priority 2
WCAG Guideline 2. Don't rely on color alone.
Colours that do not contrast sufficiently can make the web page difficult or impossible to read when used together. Older users or those with some form of colour blindness might find it hard to read text where foreground and background colour combinations are similar. In addition, some technologies, such as overhead projectors, use a reduced palette to display web pages, so pages with insufficient contrast between their components may become unusable.
Requirement
Ensure that foreground and background colour combinations provide sufficient contrast.
Checking Tool
- Internet Explorer - AIS toolbar:
Colour > Contrast Analyser - Juicy Studio Online Contrast Checker Tool (juicystudio.com/services/colourcontrast.php)
Information Source
The original source of this information is located on the W3C web site (www.w3.org/TR/WCAG10-TECHS/#tech-color-contrast)
Back to Core Guidelines