html运行实例（responsive_image_background

代码示例：（标识：responsive_image_background_2）

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
div {
  width: 100%;
  height: 400px;
  background-image: url('/static/demo/images/flower-5.jpg');
  background-size: 100% 100%;
  border: 1px solid red;
}
</style>
</head>
<body>

<p>请调整浏览器窗口大小来查看效果。</p>

<div></div>

</body>
</html>