//source.js line 1325
for (let i = 0; i < 3; i++) {
          switch (i) {
            case 0:
              if (key !== 'transform') { // the CSS transform behaves strangely
                value = this.css[keyInfo.css || key];
              }
              break;
            case 1:
              value = this.style[key];
              break;
            case 2:
              value = this.attr(key);
              break;
          }