Test all major code paths in the CSS2 10.6.4 algorithm for computing
height of absolutely positioned non-replaced elements:
- Rules 4, 5, 6 (one auto among top/height/bottom)
- Over-constrained case (none auto)
- Auto margin solving (one auto, both auto)
- Min-height and max-height re-solve for rules 4, 5, 6
- Min/max with auto margins
- Borders and padding interaction with min-height
