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<!doctype html>
<style>
#ref {
height: 50px;
width: 50px;
background: blue;
}
</style>
<!-- The testcase's masked area should render as two 50px-wide squares, one to the lower-right of the other. -->
<div id="ref"></div>
<div id="ref" style="position:relative; left: 50px"></div>