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// 现代浏览器clearfix方案，不支持IE6/7
.clearfix:after {
    display: table;
    content: " ";
    clear: both;
}

// 全浏览器通用的clearfix方案
// 引入了zoom以支持IE6/7
.clearfix:after {
    display: table;
    content: " ";
    clear: both;
}
.clearfix{
    *zoom: 1;
}

// 全浏览器通用的clearfix方案【推荐】
// 引入了zoom以支持IE6/7
// 同时加入:before以解决现代浏览器上边距折叠的问题
.clearfix:before,
.clearfix:after {
    display: table;
    content: " ";
}
.clearfix:after {
    clear: both;
}
.clearfix{
    *zoom: 1;
}