代码示例：（标识：css3_object-fit_all）
<!DOCTYPE html>
<html>
<head>
<style>
.fill {object-fit: fill;}
.contain {object-fit: contain;}
.cover {object-fit: cover;}
.scale-down {object-fit: scale-down;}
.none {object-fit: none;}
</style>
</head>
<body>
<h1>object-fit 属性</h1>
<h2>No object-fit:</h2>
<img src="/static/demo/images/tulip.jpg" alt="Tulip" style="width:200px;height:400px">
<h2>object-fit: fill (this is default):</h2>
<img class="fill" src="/static/demo/images/tulip.jpg" alt="Tulip" style="width:200px;height:400px">
<h2>object-fit: contain:</h2>
<img class="contain" src="/static/demo/images/tulip.jpg" alt="Tulip" style="width:200px;height:400px">
<h2>object-fit: cover:</h2>
<img class="cover" src="/static/demo/images/tulip.jpg" alt="Tulip" style="width:200px;height:400px">
<h2>object-fit: scale-down:</h2>
<img class="scale-down" src="/static/demo/images/tulip.jpg" alt="Tulip" style="width:200px;height:400px">
<h2>object-fit: none:</h2>
<img class="none" src="/static/demo/images/tulip.jpg" alt="Tulip" style="width:200px;height:400px">
</body>
</html>
