Although documentation states: "If you want to use the attribute value of an element for selected instead of the index, set this to the name of the attribute." there is no implementation of this attribute, nor is there a reference to a behavior implementing this attribute.
Although documentation states: "If you want to use the attribute value of an element for selected instead of the index, set this to the name of the attribute." there is no implementation of this attribute, nor is there a reference to a behavior implementing this attribute.