Why are the dimensions of a maximized window larger than the monitor?

Raymond ChenMarch 4, 2015Mar 4, 201503/4/15

When you inspect the window rectangle of a maximized window, you might notice that its dimension are actually slightly larger than the screen. The upper left corner is something like (−8, −8) and the lower right corner is correspondingly eight pixels beyond the bottom right corner of the screen. Why is that? The extra eight pixels ...