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<html><body><table id="myTable" border="1"> <tr> <th>Month</th> <th>Savings</th> </tr> <tr> <td>January</td> <td>$100</td> </tr> <tr> <td>February</td> <td>$150</td> </tr></table><br><button type="button" onclick="myFunction()">Collapse border</button><script>function myFunction() { document.getElementById("myTable").style.borderCollapse = "collapse";}</script></body></html>