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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 tr elements in the table.</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 src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>