hmm, could be my old FF (or hidpi) but many of the examples just dont work. Jittery scrolling on the landscape, and circles that start teleporting back and for

hmm, could be my old FF (or hidpi) but many of the examples just dont work. Jittery scrolling on the landscape, and circles that start teleporting back and forth on the sliders, and one that vanishes to the left. To me that just highlights another reason to keep it simple... checkbox?