See mockup on codepen: https://cdpn.io/enalean/debug/615728ad14def79e9b694647c582ce16
Functional overview
There are two progress bars visible: one for the time remaining, one for the number of open elements remaining in the backlog. The progress bars should be present on all tabs of the milesone: Overview, Planning, Taskboard.
They are NOT present on the cardwall tab.
Technical overview
The progress bars should expose a "vanilla JS" API: either watch an HTML attribute or react on a custom event. That way, we have a simple way to work with them with either Planning (AngularJS), Overview (Vanilla JS), Taskboard (Vue + Typescript).
Given they must appear on Planning and Overview, they MUST run on IE11.