[crisnoble]

You certainly can and should use the underlying concepts, keyframes and pseudo content "in prod". You could use this stopwatch as well. Why not? It all depends on what you are trying to accomplish.

If everyone is worried that the tech is too scary or unstable or "wrong" TM, then we will never push the web forward into new territory. Remember when all form submissions forced a page refresh? If people were too afraid of front-end validation and AJAX calls then this would still be the reality.