sklamať písanie Smrť čeľuste html select box nedorozumenie napodobniť tápanie
forms - HTML multiple select box - Stack Overflow
Dropdown Search Box with HTML, CSS & JavaScript | Plantpot
Create Beautiful <SELECT> Dropdown With EasyDropDown.js - Hongkiat
GitHub - PhilippeMarcMeyer/vanillaSelectBox: A dropdown menu with lots of features that takes a select tag and transforms it into a single or multi- select menu with 1 or 2 levels
How to Style Your Select Boxes
A Bootstrap / jQuery based select box with search and multi-select options