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<!DOCTYPE HTML>
<html lang="en">
<head>
<style type="text/css">
#wrap {width:600px; border:1px solid;position:relative}
.a {background:lime; color:#fff; width:80%;}
.b {position:absolute; right:0; width:18%; background: cyan; color: #000; height:10em;}
textarea {box-sizing: border-box; width: 100%; height:10em;}
</style>
<title>test</title>
</head>
<body>
<div id="wrap">
<div class="b"></div>
<div class="a"><textarea></textarea></div>
</div>
</body>
</html>