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

The constraint is on the point of the cursor where the click location is read. The rest of the pointer is just decoration to help you see it. Since the arrow extends from the bottom right to that point, it has to go off-screen in order to reach the full extents of the screen. If the entire cursor were constrained, the bottom and left edges of the screen would by unclickable.