code: function patch(element, previous, style) {
    if (!previous && !style) {
      return style;
    }
    var rule;
    if (typeof style === 'object') {
      if (typeof previous === 'object') {
        for (rule in previous) {
          if (!style[rule]) {
            domElementCss(element, rule, null);
          }
        }
        domElementCss(element, style);
      } else {
        if (previous) {
          element.setAttribute('style', '');
        }
        domElementCss(element, style);
      }
    } else {
      element.setAttribute('style', style || '');
    }
  }
docs: Maintains state of element style attribute.
  
  @param  Object element   A DOM element.
  @param  Object previous  The previous state of style attributes.
  @param  Object style     The style attributes to match on.