Function css

Sortable.js:188–205

(el, prop, val)

    }
  }
  function css(el, prop, val) {
    var style = el && el.style;
    if (style) {
      if (val === void 0) {
        if (document.defaultView && document.defaultView.getComputedStyle) {
          val = document.defaultView.getComputedStyle(el, '');
        } else if (el.currentStyle) {
          val = el.currentStyle;
        }
        return prop === void 0 ? val : val[prop];
      } else {
        if (!(prop in style) && prop.indexOf('webkit') === -1) {
          prop = '-webkit-' + prop;
        }
        style[prop] = val + (typeof val === 'string' ? '' : 'px');
      }
    }
  }
  function matrix(el, selfOnly) {
    var appliedTransforms = '';
    if (typeof el === 'string') {