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<!DOCTYPE html> <html> <head> <script> function createCaption(id) { document.getElementById(id).createCaption().innerHTML = "My new caption"; } </script> </head> <body> <table id="myTable" style="border: 1px solid black"> <tr> <td>Row1 cell1</td> <td>Row1 cell2</td> </tr> <tr> <td>Row2 cell1</td> <td>Row2 cell2</td> </tr> </table> <p> <input type="button" onclick="createCaption('myTable')" value="Create caption"> </p> </body> </html>