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<!DOCTYPE html> <html> <head> <style> table, th, td { border: 1px solid black; } </style> </head> <body> <h1>Change border-collapse with JavaScript</h1> <p>Click the "Try it" button to change the border-collapse property of the TABLE element:</p> <button onclick="myFunction()">Try it</button> <table id="myTABLE"> <tr> <th>Name</th> <th>Age</th> </tr> <tr> <td>Emil</td> <td>9</td> </tr> <tr> <td>Tobias</td> <td>7</td> </tr> <tr> <td>Linus</td> <td>2</td> </tr> </table> <script> function myFunction() { document.getElementById("myTABLE").style.borderCollapse = "collapse"; } </script> </body> </html>