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<title>纯CSS实现“三角形箭头”布局的代码</title>
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<div style="position: relative; background: red; padding: 20px; color: #fff; margin-bottom: 30px;"> <span style="position: absolute; left: 30px; top: -16px; width: 0; height: 0; font-size: 0; border-width: 16px; border-style: dashed dashed dashed solid; border-color: transparent transparent transparent red;"></span>纯CSS实现“三角形箭头”布局的代码</div>
<div style="position: relative; background: red; padding: 20px; color: #fff; margin-bottom: 30px;"> <span style="position: absolute; left: 30px; top: -16px; width: 0; height: 0; font-size: 0; border-width: 16px 24px; border-style: dashed dashed dashed solid; border-color: transparent transparent transparent red;"></span> <span style="position: absolute; left: 14px; top: -32px; width: 0; height: 0; font-size: 0; border-width: 16px; border-style: dashed dashed solid dashed; border-color: transparent transparent #fff transparent;"></span>纯CSS实现“三角形箭头”布局的代码</div>
<div style="position: relative; background: red; width: 160px; padding: 20px; color: #fff; margin-bottom: 30px;"> <span style="position: absolute; left: 0px; top: -12px; width: 188px; height: 0; font-size: 0; border-width: 6px; border-style: dashed dashed solid dashed; border-color: transparent transparent red transparent;"></span> 模拟梯形边<span style="position: absolute; left: 0px; bottom: -12px; width: 188px; height: 0; font-size: 0; border-width: 6px; border-style: solid dashed dashed dashed; border-color: red transparent transparent transparent;"></span> </div>
<h2>看看这个例子就会明白所谓“三角边”了</h2>
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<h2>把某些边透明掉就可以模拟三角形了，注意ie6下透明的边要是dotted或dashed</h2>
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