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<!DOCTYPE HTML>
<div style="width:400px;">
<span style="opacity:0.5;">
<span style="position:relative; display:inline-block; width:400px; height:200px;"></span>
<span style="position:relative; top:-300px; display:inline-block; background:lime; width:400px; height:400px;"></span>
</span>
</div>