code: function set(name, element, previous, props) {
    if (set.handlers[name]) {
      set.handlers[name](name, element, previous, props);
    } else if (previous[name] !== props[name]) {
      element[name] = props[name];
    }
  }
docs: Sets a property.
  
  @param  String name      The property name to set.
  @param  Object element   A DOM element.
  @param  Object previous  The previous state of properties.
  @param  Object props     The properties to match on.