How often is opacity and movement supported ?

Hi,
I’m designing a multichoice test on XojoWeb I designed very simple yet nice animation (using web.animator) of the controls that move out from the screen also fading away.
I was wondering if these effects are supported by most browsers or not because it took me a lot of work and I wouldnt like to find out it is only supported
on a very few browsers.

what are your thoughts ?
thanks