tests[''] = function()

in static/assets/js/modernizr.js [619:640]


    tests['cssgradients'] = function() {
        /**
         * For CSS Gradients syntax, please see:
         * webkit.org/blog/175/introducing-css-gradients/
         * developer.mozilla.org/en/CSS/-moz-linear-gradient
         * developer.mozilla.org/en/CSS/-moz-radial-gradient
         * dev.w3.org/csswg/css3-images/#gradients-
         */

        var str1 = 'background-image:',
            str2 = 'gradient(linear,left top,right bottom,from(#9f9),to(white));',
            str3 = 'linear-gradient(left top,#9f9, white);';

        setCss(
             // legacy webkit syntax (FIXME: remove when syntax not in use anymore)
              (str1 + '-webkit- '.split(' ').join(str2 + str1) +
             // standard syntax             // trailing 'background-image:'
              prefixes.join(str3 + str1)).slice(0, -str1.length)
        );

        return contains(mStyle.backgroundImage, 'gradient');
    };