html 表头固定

<div style="width: 100%; min-width: 300px; padding-right: 10px;">
    <table style="width: 100%; min-width: 300px;">
        <colgroup span="3"> 
            <col style="width: 24px;" /> 
            <col style="width: 42%;" /> 
            <col style="width: 51%;" /> 
        </colgroup>
        <thead>
         <tr class="property-row" style="background: #064F86;">
            <th style="text-align: center;"></th>
            <th style="text-align: left;"></th>
            <th style="text-align: left;"></th>
        </tr>
       </thead>
  </table>
</div>
 <div style="width: 100%; height: 276px; overflow-y: auto;overflow-x:hidden ">
     <table id="ATEST"  style=‘background-color: white;width: 100%;‘/>
          <colgroup span="3">
                <col style="width: 24px;" >
                <col style="width: 42%;">
                <col style="width: 51%;">
          </colgroup>
         <tr  style="display: none;" >
                <td></td>
                 <td></td>
                 <td></td>
         </tr>
  </table>
</div>