keep size constant [feature request]

[JoeriBultheel]

It would be cool to be able to use this class as a merely 2D overlay which displays text over a certain 3D position. So as to keep the size of the text constant (but do make it move along the 3D position in the 2D plane.

Would this be interesting to add to this class? (or is it overkill) Currently planning on implementing this with pure css, but would be nice just to have it as a initialisation argument for this class... :)