表格单元格填充问题与Chrome

我在Chrome表格单元格填充方面遇到很多问题。看起来，如果表格单元格不包含纯文本，则根本不应用填充。表格单元格填充问题与Chrome

我的标记：

<table> 
     <tr> 
      <th></th> 
      <th class="account-picture"></th> 
      <th class="account-name">Name</th> 
      <th class="account-email">Email</th> 
      <th class="account-last">Last Sign in</th> 
     </tr> 

     <tr> 
      <td> 
       <fieldset> 
        <ul>   
         <li><input type="checkbox" id="enabled" name="test[]" value="enabled"></li> 
        </ul>  
       </fieldset> 
      </td> 

      <td class="account-picture"> 
        <div class="online"> 
         <img src="http://www.genengnews.com/app_themes/genconnect/images/default_profile.jpg">       </div> 
      </td> 
      <td class="account-name">test test test test test test test test test test test test test test test test test test</td> 
      <td class="account-email">test test test test test test test test test test test test test test test test test test</td> 
      <td class="account-last">15 April 2012 10:19 AM</td> 
     </tr> 
</table>

的CSS：

img{ 
    height: 42px; 
    width: 42px; 
} 

td, th{  
    padding: 0 12px; 
    vertical-align: middle; 
} 

.account-picture{ 
    width: 40px; 

} 

.account-name{ 
    min-width: 100px; 
} 

.account-email{ 
    min-width: 120px; 
} 

.account-last{ 
    min-width: 140px; 
} 

table{ 
    table-layout: fixed; 
    float: none; 
    width: 100%; 
    margin-top: 10px; 
} 

td, th{  
    word-wrap: break-word; 
    padding: 0 12px; 
    vertical-align: middle; 
} 

td:first-child, th:first-child{ 
    width: 14px; 
}

和提琴：http://jsfiddle.net/5mPFk/1/

而这正是它呈现为在Firefox 11： enter image description here