- Make them navigable by keyboard (UP, DOWN, ENTER to activate option).
- Filter based on the actual text in the element, use containment condition instead of CSS selector on value prefix.
- Make all the elements in the filter searchable and reachable by keyboard.
It also handles auto selecting when an element is focus. E.g: if you tabulate to the next control in the navigable list, you want selection to update accordingly.
Jorge Manrubia