[erso]

  An interesting way to solve the issue is to hide the bar when scrolling down, and show it when scrolling up.

This pattern is one of the many irritating things about the mobile Chrome and iOS 7 browsers that prevents me from using devices implementing either.

I typically stick to reading around the top of my device, and occasionally I want to re-read something I just read. Instead of just getting to re-read the hidden lines, I have to continue scrolling while stupid chrome or a fixed bar appears, and then finally lets me scroll the content.

It's probably the case that a lot of people love this, but I hate it. If I want to see the browser chrome or navigational elements, I'm happy to tap the top of the window to scroll me there. I don't want the browser trying to figure out what I want to do based purely on scrolling.