Multiple Captions inside cells, 
<br>Nav. 4.0: last one takes effect, and close td tr.
    previous captions are totally ignored.	
    If there were no caption3, caption2 would take effect.
<br>Xena 6.0: Ignore misplaced caption tag, contents treated as text.
<table border>
  <caption>caption1</caption>
  <tr>
    <td>cell 1-1  <caption>caption2</caption>TextA
    <td>cell 1-2
  <tr>
    <td>cell 2-1
    <td>cell 2-2  <caption>caption3</caption>TextB
</table>

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