{"initial":{"foreground":"#ffffff","background":"#000000","threshold":4.5},"counterexample":{"foreground":"#777777","background":"#ffffff","threshold":4.5},"tests":[{"name":"black-white-pass","input":{"foreground":"#ffffff","background":"#000000","threshold":4.5},"expected":{"pass":true,"summary":"The color pair meets the declared contrast threshold.","checks":[{"name":"colors-valid","pass":true},{"name":"threshold-valid","pass":true},{"name":"contrast-meets-threshold","pass":true,"ratio":21}]}},{"name":"gray-on-white-fail","input":{"foreground":"#777777","background":"#ffffff","threshold":4.5},"expected":{"pass":false,"summary":"The color pair fails the declared contrast threshold or input format.","checks":[{"name":"colors-valid","pass":true},{"name":"threshold-valid","pass":true},{"name":"contrast-meets-threshold","pass":false,"ratio":4.478}]}},{"name":"maximum-ratio-boundary","input":{"foreground":"#ffffff","background":"#000000","threshold":21},"expected":{"pass":true,"summary":"The color pair meets the declared contrast threshold.","checks":[{"name":"colors-valid","pass":true},{"name":"threshold-valid","pass":true},{"name":"contrast-meets-threshold","pass":true,"ratio":21}]}}]}