mozilla/servo — pull request #2038 by SimonSapin (2014-04-04 17:26:00+00:00)
Title: 'min-height' can prevent margin collapsing through an element, like 'height'

[Relevant spec](http://dev.w3.org/csswg/css2/box.html#collapsing-margins):

> top and bottom margins of a box that does not establish a new block formatting context and that has zero computed 'min-height', zero or 'auto' computed 'height', and no in-flow children