firefox中的span在这样的情况下会失效吗?
#redblock2{ 
 	color:   #000000; 
 } 
 #redtitlesmall{ 
 	color:   #FF0033; 
 }     
  <div   id= "redblock2 ">  
                          <span   id= "redtitlesmall "> 标题2 </span>  
  </div>
------解决方案-------------------- <!DOCTYPE html PUBLIC  "-//W3C//DTD XHTML 1.0 Transitional//EN "  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">  
  <html xmlns= "http://www.w3.org/1999/xhtml ">  
  <head>  
  <meta http-equiv= "Content-Type " content= "text/html; charset=utf-8 " />  
  <title> 无标题文档 </title>  
  <style type= "text/css ">  
 #redblock2{ 
 	color: #000000; 
 } 
 #redtitlesmall{ 
 	color: #FF0033; 
 }   
  </style>  
  </head>    
  <body>    
  <div id= "redblock2 ">  
          <span id= "redtitlesmall "> 标题2 </span>  
  </div>    
  </body>  
  </html>
------解决方案--------------------没有失效啊,有什么问题?
------解决方案--------------------理论上说应该没问题
------解决方案--------------------没问题