openlayers/ol3 — pull request #2781 by fredj (2014-10-01 15:38:55+00:00)
Title: Use a standard title attribute for the control buttons

Instead of a (IMHO overcomplicated) custom span element.

As a bonus, it makes the use of the [bootstrap plugin](http://getbootstrap.com/javascript/#tooltips) very easy (the plugin uses the title attribute by default)