Remove unneeded selectors, share font-family definitions
Share styles between zoom & extent control
Make fullscreen control use shared styles
use button elements and add tooltips to zoomcontrol
use button elements instead of anchor elements and add tooltips to zoomcontrol
Better integration of button tooltips
Use «em» for buttons sizing
Make zoom control tip texts configurable
Coding style
Initialize properties in the constructor
Merge pull request #1720 from elemoine/assign

Initialize properties in the constructor
Make zoomToExtent control use <button> instead of <a>
Remove 'valueAsNumber' property from observable list

The property was removed in a0bea641d1fcbec64caf6483c88c9ddb3bea814f
Change ol.dom.Input target param from Element to HTMLInputElement
Add missing function arguments
Listen to 'input' and 'change' events
Add opacity property to ol.style.Image
Handle image opacity in ol.render.canvas.ImageReplay
Handle image opacity in ol.render.canvas.Immediate
Set ol.style.Icon opacity