I used to do this quite often when reading on a laptop with an external mouse, as an alternative to scrolling, so I could see where I was, especially on single

I used to do this quite often when reading on a laptop with an external mouse, as an alternative to scrolling, so I could see where I was, especially on single page/printer friendly views. Having an iPad and doing a lot of reading on Flipboard has "untrained" me, and I don't think I do it anymore on any platform.