I have annotated the image below with 4 colored rectangles indicating possible cursor click points.
Which is the best pixel location to use when deciding which pixel the user intended to click?
My thoughts are as follows.
A good choice, as it is indicated by the strong vertical line of high-contrast white pixels along the left of the cursor, and the cursor itself does not obscure the item being clicked.
A fair choice that reflects actual tactile experience in that the item being clicked is underneath the tip of the cursor, similar to a button being pushed must be under the tip of a finger
An okay choice, as it is indicated by the diagonal white line following the right side of the cursor
A poor choice, but it is directly next to Red while not obscuring the selection
Which pixel is actually used by modern operating systems? Why?