twitter/bootstrap — pull request #4705 by brianfeister (2012-08-25 09:56:21+00:00)
Title: Add `dynamic` helper class for popovers and an opt-in mixin to control their size, border-width, inner color, and border color

A followup from this pull request:

https://github.com/twitter/bootstrap/pull/4386#issuecomment-7849402

Looks like I missed the boat on 2.1.0-wip, and there were some changes to popovers in 2.1.0 release, this fixes the compatibility issues and handles it without the confusing math. Also added a few examples of custom styling to javascript.html docs.