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<!DOCTYPE html> <html> <body> <p><a id="myAnchor" href="../../www.example.com/test.htm#part2">Example link</a></p> <p>Click the button to change the protocol part of the link above.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myAnchor").protocol = "mailto:"; document.getElementById("demo").innerHTML = "The protocol was changed from 'http://' to 'mailto://'."; } </script> </body> </html>