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<!DOCTYPE html> <html> <head> <style> table, td { border: 1px solid black; } </style> </head> <body> <p>Click the button to return the number of cells in the table's first row.</p> <table id="myTable"> <tr> <td>cell 1</td> <td>cell 2</td> </tr> <tr> <td>cell 3</td> <td>cell 4</td> </tr> </table> <br> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myTable").rows[0].cells.length; document.getElementById("demo").innerHTML = "Found " + x + " cells in the first tr element."; } </script> </body> </html>