The browser could check whether the cursor image would be painted outside the page viewport.
In this case the browser could create a clipped version of the cursor image and set it as the new cursor.
In this case the browser could create a clipped version of the cursor image and set it as the new cursor.
It would also break the case where pages have legit uses for crosshair style cursors, or cursors that are rotated 180° in order to not overlay contents.