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<!DOCTYPE html>
<title>Reference of testcases for bug 1273042</title>
<style>
span {
height: 100px;
width: 100px;
background: green;
position: fixed;
top: 50px;
z-index: -1;
}
#test {
height: 100px;
width: 100px;
background: blue;
}
</style>
<span></span>
<div id="test"></div>