Document containing text on a background text. Sufficient contrast between foreground text and background text johannes.koch@fit.fraunhofer.de en Copyright BenToWeb 2004-2007 2005-08-11 validated

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 in http://www.w3.org/TR/2006/WD-WCAG20-20060427/appendixA.html#luminosity-contrastdef.

experts

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.

This test case maps to technique G18: Ensuring that a contrast ratio of at least 5:1 exists between text and background behind the text

The foreground and background colours have enough contrast.

Online version: sc1.4.1_l2_003.

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.