squizlabs/HTML_CodeSniffer — pull request #28 by lwright-sq (2012-08-24 01:58:38+00:00)
Title: All text with background images should ignore any solid background colour; throw warnings on contrast ratio tests

If a background image takes priority over a solid background colour, and is not defined in the same element, the background colour may not be representative of the actual colour the image has. For instance, with no solid background colour defined, text may be compared against a white background defined on the body tag. This is not desirable.