I dunno about that, but I find that holding down the Ctrl key and scrolling will increase/decrease the size of most browser windows.
Beyond that it appears that there are several magnifier functions - Windows, touchpad/mouse, and browser.
For the Windows magnifier, press the Win key and the + key to open Magnifier in full screen mode.
Then Win + or Win - to increase/decrease magnification.
EDIT: I have a Logitech trackball that allows me to assign keystroke combinations to the buttons on the trackball. I believe this is the same software for all Logitech mice.
Edited by usasma, 14 January 2016 - 04:57 PM.
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