<!DOCTYPE html>
<html>
<head>
<style>
img.background { width: 100%;
height: 100%;
position: absolute;
left: 0px;
top: 0px;
z-index: -1;
filter: blur(35px);
}
img.circle { border-radius: 50%;
display: block;
margin: 0 auto;
height: auto;
max-width: 60%;
}
</style>
</head>
<body>
<h1>filter 属性</h1>
<p>背景模糊：</p>
<img class="background" src="/i/photo/tulip.jpg" alt="Tulip" width="300" height="300">
<img class="circle" src="/i/photo/tulip.jpg" alt="Tulip" width="300" height="300">
<p><b>注释：</b>Edge 12 或 Internet Explorer 不支持 filter 属性。</p>
</body>
</html>