Example:
https://docs.python.org/2/library/re.html#

If you start scrolling down, the left panel updates in a horribly jerky and ugly fashion. It's distracting, annoying, and it makes the site look very amateurishly constructed. At the very least, just keep the panel fixed and unmoving -- just let the user scroll it as he/she needs to.

This is on Chrome browser on Mac OSX, but I think I've seen this dysfunctional behavior on other platforms as well.

I am filing this bug here because I was unable to find the place to file documentation related bugs..