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HTML清楚塌陷问题

/* 清除浮动塌陷问题 */
.clearfix:after {
clear: both;
} .clearfix:after,
.clearfix:before {
content: " ";
display: table;
}

/* 清除浮动塌陷问题 */
.clearfix:after {
	clear: both;
}

.clearfix:after,
.clearfix:before {
	content: " ";
	display: table;
}