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<!DOCTYPE html>
<div style="float: left; width: 50px; height: 20px; background: green;"></div>
<div style="float: left; clear: left; width: 100px; height: 50px; background: green;"></div>
<div style="display: inline-block;"><ruby style="ruby-position: under;">base<rt>annotation</rt></ruby></div>
</div>