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CSS Property Value - 如何background-size: cover;

background_size

【background_size】

我们想知道如何background-size: cover;


<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
body {
  background: #000 url('http://www.w3cschool.cn/style/download.png') no-repeat center
    center fixed;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}
</style>
</head>
<body>
</body>
</html>