Document containing text on a background image. Contrast for foreground text and background image johannes.koch@fit.fraunhofer.de en Copyright BenToWeb 2004-2007 2005-08-11 draft

The test is intended to fail because the luminosity contrast ratio is lower 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.

oneExpert

The foreground and background colours don't have enough contrast.

The luminosity contrast ratio is 4.35.

This test case does not map to a WCAG 2.0 technique or failure.

The foreground and background colours don't have enough contrast.

Online version: sc1.4.1_l2_018.

The WCAG WG hasn't provided threshold values for colour contrast yet.