OpenA11y Evaluation Library 2.0.5
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Color contrast of text: Enhanced
Rule: Color contrast of text: Enhanced
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Rule ID
Color 3
Conformance
Recommended
Definition
Text content must exceed Color Contrast Ratio (CCR) of 4.5 for large and/or bolded text and 7 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.
Conformance
Recommended
WCAG Success Criteria
Success Criterion 1.4.6 Contrast (Enhanced)
Other Related Success Criterion:
Success Criterion 1.4.1 Use of Color
Success Criterion 1.4.3 Contrast (Minimum)
Rule Category
Color/Content
Rule Scope
Element
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.
Information Links
WCAG 2.0 Success Criterion 1.4.6 Contrast (Enhanced): The visual presentation of text and images of text has a contrast ratio of at least 7:1, with exceptions
How to meet Success Criterion 1.4.6 Contrast (Minimum): The visual presentation of text and images of text has a contrast ratio of at least 7:1, with exceptions
G17: Ensuring that a contrast ratio of at least 7:1 exists between text (and images of text) and background behind the text
G18: Ensuring that a contrast ratio of at least 4.5:1 exists between text (and images of text) and background behind the text
G148: Not specifying background color, not specifying text color, and not using technology features that change those default
G174: Providing a control with a sufficient contrast ratio that allows users to switch to a presentation that uses sufficient contrast