twbs/bootstrap — pull request #9692 by TurchenkoAlex (2013-08-16 17:42:58+00:00)
Title: Issue #8883: make responsive visibility classes mixable with each other

visible-* classes now can be mixable with each other and hidden-* too (Issue #8883)

For example class="visible-xs visible-sm" will be visible at extra small and small screens, class="hidden-xs hidden-lg" hidden for extra small and large screen but visible for small and middle

```html

Visible on medium and extra small only

Visible on small and large only

```