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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  100%
<div class="pai">
  <div class="filho1"></div>
</div>
  
  Auto
  <div class="pai">
    <div class="filho2"></div>
  </div>
</body>
</html>
 
.pai {
  background: #bbb;
  width: 300px;
  height: 60px;
  margin-bottom: 20px;
}
​
.filho1 {
  background: #c69;
  width: 100%;
  height: 20px;
  border: 5px solid #069;
  padding: 5px;
/*   box-sizing: border-box */
}
​
.filho2 {
  background: #c69;
  width: auto;
  height: 20px;
  border: 5px solid #069;
  padding: 5px;
/*   box-sizing: border-box */
}
​
​
* {
  font-family: sans-serif;
  font-size: 1.3em;
}
 
​
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