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?

In: 0

Answer 1

Only the tip of the mouse pointer arrow is constrained.

And since the tip of the default pointer is on the upper left part of its arrow body, when you go to the top and left borders, the tip stays outside the border and so does the rest of the arrow.

But when you go to a bottom border, in order for the tip to reach the border, the rest of the arrow has to sink below.