| Title | Sufficient contrast between foreground diagram and background image |
|---|---|
| Description | Document containing a diagram on a background image. |
| Creator | BenToWeb (johannes.koch@…) |
| Rights | Copyright BenToWeb 2004-2007 |
| Language | English |
| Date | 2005-08-11 |
| Status | validated |
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 fail because the luminosity contrast ratio between diagram colour/page background colour is higher than 5, but between diagram colour/diagram background colour is lower than 5.
The formula to be used for calculating the luminosity contrast ratio can be found in http://www.w3.org/TR/2006/WD-WCAG20-20060427/appendixA.html#luminosity-contrastdef.
Accessibility expert.
“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 at line 5, column 28: http://www.w3.org/TR/2007/WD-WCAG20-20070517/Overview.html#visual-audio-contrast-contrast.
The test case fails the following success criterion at line 13, column 73: http://www.w3.org/TR/2007/WD-WCAG20-20070517/Overview.html#visual-audio-contrast-contrast.
The foreground and background colours have not enough contrast.
The luminosity contrast ratio between diagram and page background is 6.12, between diagram colour and diagram background is 4.00.
This test case does not map to a WCAG 2.0 technique or failure.
The test case fails the following success criterion at line 5, column 28: http://www.w3.org/TR/2006/WD-WCAG20-20060427/guidelines.html#visual-audio-contrast-contrast.
The test case fails the following success criterion at line 13, column 73: http://www.w3.org/TR/2006/WD-WCAG20-20060427/guidelines.html#visual-audio-contrast-contrast.
The foreground and background colours have not enough contrast.
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.