aww lol i found one where he simply bounces the ball from side to side, bu not in an arc. if you do remember the website, let me know. I shall hunt for it!
ok well here’s what i came up with:
bouncing ball but linear motion
got the arc and everything but its going to take me some time to gain an uderstanding of how the code works, so if I figure it out, you shall see my example soon!
this is probably the one you saw @ChristopherBurton but its only webkit