Write a principle of work of three existing AngularJS components

There is a big AngularJS 1.6 based web-app (it's finished) which has three components that need to be described with technical language, like you created it and then tell others the way they work under the hood. It should be a complex description of quite simple stuff to give the reader impression it's really hard thing. See attached example — you need to write something similar. Three elements for three or four pages. The three components I need to describe are: - 720kb datepicker with three directives over in; - simple action button done with Material Design Lite; - multi-select dropdown based on UI-select lib. We can pick others if you want.