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CSS Property Value - 如何box-sizing: border-box;

box_sizing

【box_sizing】

我们想知道如何box-sizing: border-box;


<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
#wrapper {
  width: 60%;
  background-color: #aaa;
  margin: 50px auto;
  line-height: 0;
}

#wrapper img {
  width: 100%;
  border: 1px dashed red;
  box-sizing: border-box;
  margin
}
</style>
</head>
<body>
  <div id="wrapper">
    <img src="http://placehold.it/200x200" />
  </div>
</body>
</html>