Tests for background-size

natural size
natural size, bottom right
contain
contain, bottom right
contain, border-box
contain, border-box, bottom right
contain, content-box
contain, content-box, bottom right
cover
cover, bottom right
cover, border-box
cover, border-box, bottom right
cover, content-box
cover, content-box, bottom right
50px
50px, bottom right
100%
100%, bottom right
100% 50%
100% 50%, bottom right
50% 100%
50% 100%, bottom right
50px 90%
50px 90%, bottom right