<!DOCTYPE html>
<body onload="document.getElementById('a').style.borderTopWidth=0;">
<div style="float:right; height: 50px; width: 20px; background: red"></div>
<div id=a style="border-top: solid 50px">
<div id=b style="float:left; clear: right; width: 100px; height:100px; border: solid orange; position:relative;"></div>
</div>
<div>
asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>asdf<br>
</div>