Thanks for pointing those out! Indeed we have to make extra corrections to make it work correctly on Safari, but the examples left those out to try to make them

Thanks for pointing those out! Indeed we have to make extra corrections to make it work correctly on Safari, but the examples left those out to try to make them easier to follow. What version of Firefox are you using? The first example I find to definitely be choppier on Firefox, but the last one looks pretty good.