When one makes a web page go full screen by pressing F11 on a keyboard, one can exit the full screen by moving the mouse pointer to the top of the screen. A button with an X on it will drop down and, when clicked on with the mouse, the window will exit full screen, same as if F11 had been pressed again.
It would be nice if one had an option to go to full screen using a mouse the same as one can exit full screen with a mouse.