Abyz - select an item in the alphabetical index

Abyz is a javascript utility that implements the selection of an element (letter) in the alphabetical index. The main objective of this utility is to reduce the space occupied by the list of letters of the alphabet (s) and / or reduce the font of the elements of the list (so that this block does not throw into the eyes), while maintaining the convenience of choosing any letter from this list.

Example , Source