Reusable UI Components By Mozilla – Brick
It aims to provide a consistent experience on desktop + mobile and an easier/friendlier usage (compared to standard JS plugins).
Currently, Brick has thirteen different tags (components) like “calendar, tooltip, slider and more“.
They can be downloaded as a complete library or separately instead of a single bundle.
Brick is very well-documented, has lots of examples and still in beta. Check this Mozilla article to read more about it.