Real row height

HTML

<table id="theTable">
  <tr>
    <td><div id="inner">Row 2</div></td>
    <td>col 2</td>
  </tr>
  <tr>
    <td>Row 2</td>
    <td>col 2</td>
  </tr>
  <tr>
    <td>Row 3</td>
    <td>col 2</td>
  </tr>
</table>

<div id="result">

</div>

CSS

#theTable {
  border: 1px solid black;
  border-collapse: collapse;
}

#theTable td {
/*  box-sizing: border-box; */
/*  margin: 3px; */
/*  padding: 3px; */
  height: 20px !important;
  border: 1px solid black;
}

/*
#inner {
  height: 30px
}
*/

JavaScript

var height = $("#theTable").height();

$("#result").text(height+" px");