Top edge containment will always be corrected if a taskbar is present, so windows will touch top taskbar.

Right edge containment will be corrected if taskbar is wider than given integer, so in this case it's indeed corrected and windows will touch right taskbar.

Bottom edge containment will never be corrected, so windows will always be 60px from the bottom edge.

Left edge containment will be corrected if taskbar is not wider than given integer, so in this case it's not corrected and windows will go under the taskbar, but only 70px from left edge (default vertical taskbar width is 100px).