Select with Select2

Theming of the form-item--select using the Select2 library.
The component is fully accessible, and will give you a filter search bar when you have more than 20 options.
It is possible using the Javascript selector to only use Select2 on a few selects, instead of all of them by default.
Specifications
Machine name
form-item--select
Built upon
Drupal Core
Drawbacks
Uses jQuery
Building blocks
HTML
CSS
Javascript
Inspired by
Flat design