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<!DOCTYPE html> <html> <body> <p><a id="myAnchor" href="../index.html">W3Schools</a></p> <p>Click the button to change the value of the id attribute of the link above to "newid".</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myAnchor").id = "newid"; document.getElementById("demo").innerHTML = "The id of the link was changed from 'myAnchor' to 'newid'."; } </script> </body> </html>