我看教程里清除浮动标准写法是.clearfloat:after{display:block;clear:both;content:"";visibility:hidden;height:0}
.clearfloat{zoom:1}但是为什么我这个只是写#box:after{content:"";clear:both;display:block;}这么写也能清除浮动，那么visibility和height属性为什么也要写？附上代码：<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
#box{}
.son{width:100px;height:100px;float:left;}
#green{background:green;}
#red{background:red;}
#blue{background:blue;}
#black{background:black;}
#box:after{content:"";clear:both;display:block;}
#box{*zoom:1}
</style>
</head>
<body>
<div id="box">
<div id="green" class="son"></div>
<div id="red" class="son"></div>
<div id="blue" class="son"></div>
</div>
</body>
</html>
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