W3School TIY Editor
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<html> <head> <script type="text/javascript"> function setBorderCollapse() { document.getElementById('myTable').style.borderCollapse="collapse"; } </script> </head> <body> <table border="1" id="myTable"> <tr> <td>100</td> <td>200</td> </tr> <tr> <td>300</td> <td>400</td> </tr> </table> <br /> <input type="button" onclick="setBorderCollapse()" value="Collapse border"> </body> </html>