<debug> 
Generates a support vector for the current browser/mode.  The result can be
added to supportsVectors to eliminate feature detection at startup time.
@private
function() {
        var tests = this.tests,
            vector = [],
            i = 0,
            ln = tests.length,
            test;

        for (; i < ln; i++) {
            test = tests[i];
            vector.push(this[test.identity] ? 1 : 0);
        }
        return vector;
    }