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<!DOCTYPE HTML>
<title>'auto' top and bottom margins on absolutely positioned elements</title>
<style>
body > div {
position: relative;
height: 100px;
border: medium solid;
}
body > div > div {
position: absolute;
top: 0;
height: 40px;
width: 10px;
background: blue;
}
</style>
<div>
<div style="left: 10px;top: 10px"></div>
<div style="left: 30px;top: 40px"></div>
<div style="left: 50px;top: 10px"></div>
<div style="left: 70px;top: 30px"></div>
</div>