| Title | Sufficient contrast for foreground text and background colour |
|---|---|
| Description | Document containing text on a background colour specified via CSS. |
| Creator | BenToWeb (johannes.koch@…) |
| Rights | Copyright BenToWeb 2004-2007 |
| Language | English |
| Date | 2005-08-11 |
| Status | draft |
Technologies are markup languages or data formats. If the technology is a markup language, “features” refers to elements and attributes.
XHTML™ 1.0 The Extensible HyperText Markup Language (Second Edition)
The test is intended to pass because the luminosity contrast ratio is higher than 10.
The formula to be used for calculating the luminosity contrast ratio can be found at http://www.w3.org/TR/2007/WD-WCAG20-20070517/#contrast-ratiodef.
Accessibility expert.
“Rules” refer to success criteria in WCAG 2.0, checkpoints in WCAG 1.0 and similar requirements.
The test case passes (line 5, column 28) the following success criterion: http://www.w3.org/TR/2007/WD-WCAG20-20070517/Overview.html#visual-audio-contrast-contrast.
The foreground and background colours have sufficient contrast.
The luminosity contrast ratio is 11.20.
This test case maps to technique G17: Ensuring that a contrast ratio of at least 7:1 exists between text and background behind the text.
The test case passes (line 5, column 28) the following success criterion: http://www.w3.org/TR/2006/WD-WCAG20-20060427/guidelines.html#visual-audio-contrast-contrast.
The foreground and background colours have enough contrast.
Online version: sc1.4.3_l3_003.
The test case needs review before it can be established if it passes or fails the following success criterion: http://www.w3.org/TR/2006/WD-WCAG20-20050630/#visual-audio-contrast-contrast.
The WCAG WG hasn't provided threshold values for colour contrast yet.