< html >
<head>
<meta charset="UTF-8">
<title></title>
<style>
img {
width: 100%;
height: auto !important;
}
</style>
</head>
<body>
<img src="images/common/1/1.jpg" style="">
<!--img width:100%;height: auto;-->
</body>
<script type="text/javascript">
</script>
< / html >
the img tag width:100%;height: auto; picture here will automatically expand and fill the screen. Why?