<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<HEAD>
<STYLE TYPE="text/css">
<!--
#a{
width:50%;
height:100px;
background:skyblue;
float:left;
}#b{
width:50%;
height:100px;
background:pink;
float:left;
}
-->
</STYLE>
</head>
<body>
<div id="a"></div>
<div id="b"></div>
</body>
</html><!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<html>
<HEAD>
<STYLE TYPE="text/css">
<!--
body {margin:0px;}
#a{
width:100%;
height:100px;
background:skyblue;
text-align:right;
}#b{
width:50%;
height:100px;
background:pink;
}
-->
</STYLE>
</head>
<body>
<div id="a">
<div id="b"></div>
</div>
</body>
</html>