Bug 977588 - [Dialer] The Active call screen does not have the option to place calls on hold.

Ok, I see. Thanks for making the effort here then. We should do this in a separate bug, though. I'm not sure about this, but I think the best way to do this is add a series of ```display: none``` label elements, and then use the ```aria-labelledby``` attribute to point the buttons to them. Please file a followup for this, and cc Yura Zenevich (:yzen) and I.