openlayers/ol3 — pull request #1771 by ahocevar (2014-02-26 18:21:41+00:00)
Title: Explicit box model definition for box model dependent sizing

The zoom in/out tooltips are clipped when a css reset sets the
box-model to anything other than content-box. This breaks the
sizing of these tooltips, because they rely on a content-box
model. This issue can e.g. be seen when using a bootstrap 3.x
bootstrap.css