Multiple caption elements, all outside td cells.
<br>Nav 4.0: the first caption is accepted, 
Others are treated as text, and moved before the table.
<br>Xena6.0: ignore misplaced caption tag. contents treated as text.
<table border>
  TextAA
  <caption>caption1</caption>TextA
  <caption>caption2</caption>TextB
  <tr>
  <caption>caption3</caption>TextC
    <td>cell 1-1</td>
  <caption>caption4</caption>TextD
    <td>cell 1-2
  <tr>
  <caption>caption5</caption>TextE
    <td>cell 2-1
    <td>cell 2-2</td>
  <caption>caption6</caption>TextF
</table>

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