How to move the contents of an inactive window under Mac

A very useful little feature in Mac OS is that we can scroll through the contents of inactive windows with the mouse and touchpad. method is very simple.

1. When the position of our mouse cursor is in an inactive window, we can scroll the contents of the inactive window by moving the mouse wheel or two fingers up and down on the touchpad, instead of switching the window to the active window.

2, this feature for file proofing or content comparison work can save a lot of time to switch windows, so as to improve work efficiency.