On computers, why is the mouse constrained in the left and top borders of the screen, but can go past the bottom and right border of the screen?

Question

On computers, why is the mouse constrained in the left and top borders of the screen, but can go past the bottom and right border of the screen?

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Answer 1

It isn’t. It just that the mouse pointer is a 1×1 pixel and the image of the mouse cursor most often is on the upper left corner. If you change the mouse cursor to some centered icon, you’ll see the left and upper parts sticking out at the right and lower edges on the screen.