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<!DOCTYPE html>
<title>tall reference, 192x384 lime, 192x384 aqua</title>
<link rel="author" title="Jeff Walden" href="" />
<style type="text/css">
width: 256px; height: 768px;
border: 1px solid black;
width: 192px; height: 768px;
#inner > div { width: 192px; height: 384px; }
#top { background-color: lime; }
#bottom { background-color: aqua; }
<div id="outer"><div id="inner"><div id="top"></div><div id="bottom"></div></div></div>