Tryit Editor v1.8

Source Code:
<!DOCTYPE html> <html> <head> <script> function padding() { document.getElementById('myTable').cellPadding="15"; } function spacing() { document.getElementById('myTable').cellSpacing="15"; } </script> </head> <body> <table id="myTable" border="1"> <tr> <td>100</td> <td>200</td> </tr> <tr> <td>300</td> <td>400</td> </tr> </table> <br> <input type="button" onclick="padding()" value="Change Cellpadding"> <input type="button" onclick="spacing()" value="Change Cellspacing"> </body> </html>
Result:
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