Two bugs with attribute valign

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explanation.)

The following HTML excerpt exposes two bugs associated with the valign 
attribute. The text consists of two TABLE elements representing 
expressions. Expression 1 shows well on the browser/editor window but 
wrongly on the PostScript output. Expression 2 it's the other way 
around. I have experienced the problem in versions 8.4 and 8.7. Thanks.

<table width="100%">
   <tbody>
     <tr valign="top">
       <td width="7%" align="right"><small>1</small>&#x2003;&#x2003;</td>
       <td width="93%">
         <table>
           <tbody>
             <tr align="center" valign="middle">
               <td width="10%">&#x2329;X, Y&#x232a; </td>
               <td width="10%">&#x2261; </td>
               <td width="10%">X &#x2192; Y </td>
               <td width="10%">&#x2261; </td>
               <td width="10%">X<br>
                 &#x2193;<br>
                 Y</td>
               <td width="10%">&#x2261; </td>
               <td width="10%">Y &#x2190; X </td>
             </tr>
           </tbody>
         </table>
       </td>
     </tr>
   </tbody>
</table>

<table width="100%">
   <tbody>
     <tr valign="top">
       <td width="7%" align="right"><small>2</small>&#x2003;&#x2003;</td>
       <td width="93%">
         <table>
           <tbody>
             <tr valign="bottom">
               <td>S &#x2192;</td>
               <td align="center">T<br>
                 &#x2193;<br>
                 X</td>
             </tr>
           </tbody>
         </table>
       </td>
     </tr>
   </tbody>
</table>

(Sorry if you received this twice. I sent it first on 27 November, 
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messages sent by others after 27 did show. Also, the archive page is 
buggy: it does not form nor order day groups correctly.)