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             <!DOCTYPE  HTML> 
            <html> 
            <head> 
            <meta  charset="UTF-8"> 
            <script type="text/javascript"  src="/libs/jquery/1.4.4/jquery.min.js"></script> 
            <title>三种纯CSS实现三角形的方法</title> 
            <link  rel="stylesheet" > 
            <style type="text/css"> 
            .page-info {  padding:8px 15px; background:#fcea9e; border-bottom:1px solid #b6bac0;  font:normal 16px Georgia; } 
            .page-info h1 { float:left; } 
            .page-info a {  font-weight:bold; color:#222; }   
            .return-article { float:right;  } 
            .return-article h2{ display:inline; } 
            /*border模拟tips*/ 
            .message-box  { position:relative; float:left; margin:80px 0 0 100px; width:240px; 
            height:60px; line-height:60px; background:#E9FBE4; box-shadow:1px 2px 3px  #E9FBE4; 
            border:1px solid #C9E9C0; border-radius:4px; text-align:center;  color:#0C7823; } 
            .triangle-border { position:absolute; left:30px;  overflow:hidden; width:0; height:0; 
            border-width:10px; border-style:solid dashed  dashed dashed; } 
            .tb-border { bottom:-20px; border-color:#C9E9C0 transparent  transparent transparent; } 
            .tb-background { bottom:-19px;  border-color:#E9FBE4 transparent transparent transparent; } 
            /*字符模拟tips*/ 
            .triangle-character  { position:absolute; left:30px; overflow:hidden; width:26px; height:26px;  font:normal 26px "宋体"; } 
            .tc-background { bottom:-12px; color:#E9FBE4;  } 
            .tc-border {  bottom:-13px; color:#C9E9C0;} 
            /*css3  transfrom 模拟tips*/ 
            .triangle-css3 { position:absolute; bottom:-8px;  bottom:-6px; left:30px; overflow:hidden; width:13px; height:13px;  background:#E9FBE4; border-bottom:1px solid #C9E9C0; border-right:1px solid  #C9E9C0;} 
            .transform { -webkit-transform:rotate(45deg);  -moz-transform:rotate(45deg); -o-transform:rotate(45deg); 
            transform:rotate(45deg); } 
            /*ie7-9*/ 
            .ie-transform-filter {  
                -ms-filter:  "progid:DXImageTransform.Microsoft.Matrix(M11=0.7071067811865475,  M12=-0.7071067811865477, M21=0.7071067811865477, M22=0.7071067811865475,  SizingMethod='auto expand')"; 
                filter:  progid:DXImageTransform.Microsoft.Matrix(  M11=0.7071067811865475,M12=-0.7071067811865477, 
            M21=0.7071067811865477,M22=0.7071067811865475,SizingMethod='auto  expand'); 
            } 
            </style> 
            </head> 
            <body> 
            <div  class="message-box"> 
              <span>我是利用 border 属性实现的</span> 
               <div class="triangle-border tb-border"></div> 
              <div  class="triangle-border tb-background"></div> 
            </div> 
            <div  class="message-box"> 
              <span>我是利用 ◆ 字符实现的</span> 
              <div  class="triangle-character tc-border">◆</div> 
              <div  class="triangle-character tc-background">◆</div> 
            </div> 
            <div  class="message-box"> 
              <span>我是利用 css transfrom  属性实现的</span> 
              <div class="triangle-css3 transform  ie-transform-filter"></div> 
            </div> 
            </body> 
            </html> 
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