code: function unset(name, element, previous) {
    if (unset.handlers[name]) {
      unset.handlers[name](name, element, previous);
    } else {
      element.removeAttribute(name);
    }
  }
docs: Unsets an attribute.
  
  @param  String name      The attribute name to unset.
  @param  Object element   A DOM element.
  @param  Object previous  The previous state of attributes.