ipython/ipython — pull request #6341 by jdfreder (2014-08-21 15:36:41+00:00)
Title: Add semantic classes to top-level containers for single widgets

Supersedes #6256

This makes it much easier to customize all widgets of a certain type using
CSS. For example, to change just the IPython widget selects, a CSS
rule like .widget-select select {...} should work well.