twitter/bootstrap — pull request #6027 by polymetis (2012-11-27 13:59:34+00:00)
Title: Changed to a percentage to avoid magic number issues

I changed the img circle class to a percentage to avoid some edge cases and, at least I think, make it a little faster so it doesn't compute extraneous pixels.

What we lose in this bargain is [Safari 5.0 and back](http://muddledramblings.com/table-of-css3-border-radius-compliance/) but it will just default to a square at that point. It really just treating old Safari like we treat sub-ie9.

Thoughts?