In the following test cases a container with green background has position:relative and includes a blue box with position:absolute, left:0, bottom:0. All is wrapped in a box with hasLayout, red border, and 10px vertical padding.
This is a green container with position:relative, NO hasLayout, and an internal p with vertical margins
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Nunc elementum fermentum sem. Nullam nulla est, imperdiet quis, ultricies id, suscipit sit amet, odio. Morbi tincidunt dui eget justo. Morbi mi. Quisque tristique vulputate tortor. Ut tempor sapien a purus. Vivamus ultricies pellentesque purus. Mauris ultrices arcu quis nunc.
This is a green container with position:relative, hasLayout, and an internal p with vertical margins
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Nunc elementum fermentum sem. Nullam nulla est, imperdiet quis, ultricies id, suscipit sit amet, odio. Morbi tincidunt dui eget justo. Morbi mi. Quisque tristique vulputate tortor. Ut tempor sapien a purus. Vivamus ultricies pellentesque purus. Mauris ultrices arcu quis nunc.