| Title | Enough contrast for foreground text and background text |
|---|---|
| Description | Document containing text on a background text. |
| Creator | BenToWeb (johannes.koch@…) |
| Rights | Copyright BenToWeb 2005-2007 |
| Language | English |
| Date | 2005-08-11 |
| Status | accepted QA |
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 between foreground text colour/background colour and foreground text colour/background text colour is higher than 5.
The formula to be used for calculating the luminosity contrast ratio can be found at http://www.w3.org/TR/2006/WD-WCAG20-20060427/appendixA.html#luminosity-contrastdef.
Three or more accessibility experts.
“Rules” refer to success criteria in WCAG 2.0, checkpoints in WCAG 1.0 and similar requirements.
The test case fails 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.
The luminosity contrast ratio between foreground and background text colour is 7.50, between foreground text and background colour 15.60.
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.
It is not clear if there is sufficient colour contrast for some people with low vision.
The WCAGWG hasn't provided threshold values for colour contrast yet.