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<title>css模拟阴影和小三角</title>
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a{ color:#666; text-decoration:none; line-height:25px; text-indent:24px;}
.w{ 200px; position:absolute; background:#999; left:400px; top:200px; font-size:12px; text-align:left}/*模拟灰色阴影背景层*/
.h{ 200px; position:absolute; background:#999; left:400px; top:300px; font-size:12px; text-align:left}/*模拟灰色阴影背景层*/
.x{ 180px; position:relative; background:#ff9; border:1px solid #F96; padding:10px; left:-4px; top:-4px;}/*内容div*/
.y , .z{position:absolute; top:20px;}/*控制三角的位置上下左右*/
.y{ color:#ff9; left:183px; font-size:34px;}/*模拟小三角*/
.z{ color:#f96; left:185px;font-size:34px;}/*模拟小三角*/
.a , .b{position:absolute; top:20px;}/*控制三角的位置上下左右*/
.a{ color:#ff9; left:-16px; font-size:34px;}/*模拟小三角*/
.b{ color:#f96; left:-18px;font-size:34px;}/*模拟小三角*/
.l680{ left:680px;}
.t400{ top:400px;}
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<div class="x"><p><a href="#">用面向对象的思想去书写css,用面向对象的心态去书写css。(右三角)</a></p>
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<div class="x"><p><a href="#">用面向对象的思想去书写css,用面向对象的心态去书写css。(左三角)</a></p>
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