How can we add CSS3 animation in Opera web browser latest version?

Question

My CSS3 animations with keyframes which work on sololearn don't work on my PC Opera web browser.

Answer 1

opera is like very old,and like its cousin ie,it doesn't support so many things.
try playing around with vendor prefixes,works like a charm

Answer 2

᠌᠌brains You would laugh when you realise what mistake I had done that prevented my animation to work. It was that I set the values of the opacity property in percentages in each keyframe. Thanks to the console that I realised my fault and after I replaced the %age values with decimals between 0 and 1, my animation began working well.
You are correct, Opera seems quite old because inspite of being the latest version, my Opera PC couldn't accept %age values for opacity.
BTW, thanks for help.