I don't think you can do quite that but I suggest you try Guake or Yakuake s (depending on your environment). Then configure opacity so you can read the document through it. I like Yakuake more but currently I don't feel it's worth installing the entire KDE system just for it. The idea is that you can open the entire terminal with a single keypress (F12 in my case) so you can happily code and when you need to change pages close the terminal swap the page and re-open the terminal. Just two extra key presses.