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<!DOCTYPE html>
<style>
#containing-block {
position: relative;
zoom: 2;
}
#anchor {
position: absolute;
width: 200px;
height: 100px;
background: red;
}
#anchor-positioned {
position: absolute;
width: 200px;
height: 100px;
background: green;
z-index: 1;
}
</style>
Test passes if no red is visible.
<div id="containing-block">
<div id="anchor"></div>
<div id="anchor-positioned"></div>
</div>