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Test Info:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<style type="text/css">
.multicol {
margin: 1em;
border: solid silver;
width: 500px;
column-width: 100px;
column-gap: 0;
height: 100px;
}
div {
margin: 2px 0;
border: 2px white;
border-style: solid none;
}
.float {
float: right;
margin: 44px 0;
width: 15px;
background: aqua;
border-color: aqua;
height: 296px;
}
#float0 {
float: left;
width: 30px;
margin-right: 5px;
margin-bottom: 0;
}
#float1 {
margin-left: -15px;
margin-right: -5px;
position: relative;
right: 5px;
}
#float2 {
margin-left: 5px;
margin-right: 15px;
}
#clear {
clear: left;
border: 2px solid orange;
}
#c1 {
height: 142px;
}
#c2 {
border-bottom: none;
}
#c3 {
height: 100px;
border-bottom: 4px solid orange;
}
#c4 {
height: 192px;
border-bottom: 4px solid orange;
}
hr {
border: solid orange 20px;
border-style: none solid;
height: 4px;
margin: 0 -5px;
padding: 0;
position: relative;
z-index: 20;
}
#c2 > hr {
margin-top: 44px;
}
</style>
<body onload="var f = document.getElementById('float0');
f.style.height = '20px';
document.body.offsetHeight;
f.style.height = '900px';
document.body.offsetHeight;
f.style.height = '';
document.body.offsetHeight;
var c = document.getElementById('c2');
c.style.height = '900px';
document.body.offsetHeight;
c.style.height = '';
">
<div class="multicol">
<div id="c1">
<div id="c2">
<div class="float" id="float0"></div>
<div class="float" id="float1"></div>
<div class="float" id="float2"></div>
<hr>
</div>
</div>
<div id="c3"><hr><div id="clear"></div></div>
<div id="c4"></div>
</div>