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css清除浮动最佳实践

/* best practical*/
/* old */
.clearfix:before, .clearfix:after{
    overflow: hidden;
    display: table;
    visibility: hidden;
    content: '';
    clear: both;
}

/* new */
.clearfix::before, .clearfix::after{
    overflow: hidden;
    display: table;
    visibility: hidden;
    content: '';
    clear: both;
}

/* new clearfix */
.clearfix::after {
    content: "";
    display: table;
    clear: both;
    overflow: hidden;
    visibility: hidden;
}

/* old clearfix */
.clearfix:after {
    content: "";
    display: block;
    clear: both;
}

本文转载自https://developer.mozilla.org/zh-CN/docs/Web/CSS/clear