W3School TIY Editor
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<html> <head> <script type="text/javascript"> function changeWidth() { document.getElementById("table1").width="100%"; } </script> </head> <body> <table id="table1" border="1"> <thead> <tr> <th>Firstname</th> <th>Lastname</th> </tr> <tr> <td>Peter</td> <td>Griffin</td> </tr> </table> <br /> <input type="button" onclick=changeWidth() value="Change table width" /> </body> </html>