Pretty Select Box Replacemenet With Pure JavaScript - tastySelect | CSS Script
Drop-Down Combo-box in HTML (with Javascript or JQuery)? - Stack Overflow
Custom select box with search bar using HTML, CSS & JS || complete code - YouTube
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