css/css-backgrounds/css3-background-size-contain.html

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  <meta charset="UTF-8">
  <title>CSS3 background-size:contain</title>
  <link rel="author" title="Yue Hu" href="mailto:miniwade514@gmail.com" />
  <link rel="reviewer" title="Dayang Shen" href="mailto:shendayang@baidu.com" /> <!-- 2013-09-03 -->
  <link rel="help" href="http://www.w3.org/TR/css3-background/#the-background-size" />
  <link rel="match" href="reference/css3-background-size-contain-ref.html">
  <style>
    div {
      width: 200px;
      height: 250px;
      border: 5px dashed black;
      overflow: hidden;
      background-image: url(support/60x60-green.png);
      background-size: contain;
      background-repeat: no-repeat;
    }
  </style>
</head>
<body>
  <p>The test passes if the green box image is scaled to fit the width of the outer box, while preserving its intrinsic aspect ratio.</p>
  <div></div>
</body>
</html>