Text must exceed CCR threshold

Definition Text content must exceed Color Contrast Ratio (CCR) of 3.1 for large and/or bolded text and 4.5 for any other size or style of text.
Purpose
  • The higher the color contrast of text the more easy it is to read, especially for people with visual impairments.
Required Yes for HTML4 Legacy Techniques ruleset mapping
WCAG 2.0 Success Criteria

1.4.3 Contrast (Minimum) (Level AA, Primary Success Criterion)

Rule Category Styling/Content
Scope Element
Target Resources All elements with text content
  • textnodes
Techniques
  • Change the foreground color to a more complementary color to the background color.
  • Change the background color to a more complementary color to the foreground color.
  • Remove background images or verify they do not compromise color contrast requirements.
Manual Checks
  • Use graphic editing tools to analyze the color(s) of the background image and then recacluate the CCR with the range of colors in the background image.
  • Verify the range of colors that could be part of the background of text is have a CCR > 4.5.
Informational Links