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<!DOCTYPE html> <html> <head> <style> table, th { border: 1px solid black; } </style> </head> <body> <p>Click the button to return the value of the headers attribute of th with id "myTh".</p> <table id="myTable"> <tr> <th id="name" colspan="3">Name</th> </tr> <tr> <th id="myTh" headers="fname">First name</th> <th headers="mname">Middle name</th> <th headers="lname">Last name</th> </tr> </table> <br> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myTh").headers; document.getElementById("demo").innerHTML = x; } </script> </body> </html>