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<title> absolutely positioned element should be vertically centered even if the height is bigger than that of the containing block (reference) - bug 812899</title>
body > div {
font-size: 16px;
position: relative;
border: red solid;
margin-top: 5em;
width: 5em;
height: 5em;
body > div > div {
position: absolute;
border: medium solid blue;
margin: auto auto;
height: 150%;
width: 150%;
left: 0px;
right: 0px;
top: 0px;
bottom: 0px;