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Test Info:

<!DOCTYPE html>
<!-- Important: no meta charset! -->
<title>Testcase Bug 851514</title>
#parent {
position: fixed;
height: 30px;
width: 30px;
background: green;
left: 70px;
top: 70px;
overflow: hidden;
#child {
position: fixed;
top: auto;
left: auto;
width: 10px;
height: 10px;
background: purple;
<div id="parent">
<div id="child"></div>
The purple block should be inside the green block.