quirks/reference/table-cell-width-calculation-abspos-ref.html

<style>
table {
  font-size: 10px;
  font-family: Ahem;
}
img {
  vertical-align: bottom;
  width: 10px;
  height: 10px;
  background: black;
}
</style>
<table>
  <tr>
    <td id="td">1234567<img id="img" src=""></td>
  </tr>
</table>