How do I iterate through table rows and cells in JavaScript?

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If I have an HTML table…say

<div id="myTabDiv">
<table name="mytab" id="mytab1">
  <tr> 
    <td>col1 Val1</td>
    <td>col2 Val2</td>
  </tr>
  <tr>
    <td>col1 Val3</td>
    <td>col2 Val4</td>
  </tr>
</table>
</div>

How would I iterate through all table rows (assuming the number of rows could change each time I check) and retrieve values from each cell in each row from within JavaScript?

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