I don't know, this is providing a visual feedback that an action was completed, which is much better than the previous material-favorite of expanding circles of

I don't know, this is providing a visual feedback that an action was completed, which is much better than the previous material-favorite of expanding circles of slightly-darkened color. I know in my password manager app the button is so small and the animation so fast that by the time my finger is up off the copy password button I'm not sure if anything has happened (thankfully they recently added a toast to prevent this issue).