W3School TIY Editor
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<html> <head> <script type="text/javascript"> function alertId() { alert(document.getElementById("td1").id); } </script> </head> <body> <table border="1"> <tr> <th>Firstname</th> <th>Lastname</th> </tr> <tr> <td id="td1">Peter</td> <td id="td2">Griffin</td> </tr> </table> <br /> <input type="button" onclick=alertId() value="Alert ID" /> </body> </html>