CSS Layout How to - Use calc() in css3 to calculate width

Question

We would like to know how to use calc() in css3 to calculate width.

Answer


<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
html, body {<!--   w w w.  j  av  a2s  . c  om-->
  height: 100%;   
}
#left, #right {
  width: -moz-calc(50% - 20px);
  width: -webkit-calc(50% - 20px);
  width: calc(50% - 20px);
  float: left;
  background-color: #FEE;
  height: 100%;
}
#middle {
  width: 40px;
  float: left;
  background-color: gray;
  height: 100%;
}
  </style>
</head>
<body>
    <div id="left">Hello</div>
    <div id="middle"></div>
   <div id="right">World!</div>
</body>
</html>

The code above is rendered as follows: