wcag-contrast
Version:
evaluate the wcag color contrast score for two colors
3 lines (2 loc) • 796 B
JavaScript
var n=.2126,r=.7152,t=.0722,e=1/12.92;function u(n){return Math.pow((n+.055)/1.055,2.4)}function a(a){var i=a[0]/255,s=a[1]/255,o=a[2]/255,c=i<=.03928?i*e:u(i),p=s<=.03928?s*e:u(s),l=o<=.03928?o*e:u(o);return c*n+p*r+l*t}function i(n){var r=255;8===(n=n.replace(/^#/,"")).length&&(r=parseInt(n.slice(6,8),16),n=n.substring(0,6)),4===n.length&&(r=parseInt(n.slice(3,4).repeat(2),16),n=n.substring(0,3)),3===n.length&&(n=n[0]+n[0]+n[1]+n[1]+n[2]+n[2]);var t=parseInt(n,16);return[t>>16,t>>8&255,255&t,r]}function s(n,r){return(Math.max(n,r)+.05)/(Math.min(n,r)+.05)}function o(n,r){return s(a(n),a(r))}exports.luminance=s,exports.rgb=o,exports.hex=function(n,r){return o(i(n),i(r))},exports.score=function(n){return n>=7?"AAA":n>=4.5?"AA":n>=3?"AA Large":"Fail"};
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