If the browser is going to allow scrolljacking, then I understand the case for it being implemented in the browser's CSS engine. But on so many sites it's a usa

If the browser is going to allow scrolljacking, then I understand the case for it being implemented in the browser's CSS engine. But on so many sites it's a usability issue because space, pgup/pgdn, arrow keys (not to mention Vimium navigation) do not behave predictably.