Comment 4 for bug 425583

Great! Thanks for the clarifications.

The lazr picker (see the example page) does something very similar for filtering and picking an item from a list, that's the closest that I'm aware of. (on the example page - examples/picker/index.html, type 'peo' into the field and search and you'll see the two matching items).

I'm not sure how much work would be involved to branch this behavior for filtering a displayed list of items.