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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <div class="square-test">这里使用第三种方法设置margin-top</div>
<div class="square">这里设置了最大高度但没生效</div>
<div class="square-padding">这里使用padding实现无需触发BFC</div>
<div class="square">这里设置了最大高度但没生效</div>
            
          
!
            
              .square
	width 20%
	float left
	margin 2.5%
	height 0
	padding-bottom: 20%
	background #ff0000
	max-height 2em
.square-test
	width 20%
	float left
	margin 2.5%
	background #ff0000
	overflow hidden
	max-height 2em
	&:after
		content ''
		display block
		margin-top 100%
.square-padding
	width 20%
	float left
	margin 2.5%
	background #ff0000
	max-height 2em
	&:after
		content ''
		display block
		padding-top 100%
            
          
!
999px
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