Checkpoint 1.7 - RSS

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 a text where foreground and background colour combinations are similar in tone. 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

The web page is usable with javascript disabled.

Recommendation

Ensure that foreground and background colour combinations provide sufficient contrast when viewed by someone having colour deficits or when viewed on a black and white screen.

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)