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<!DOCTYPE html> <html> <body> E-mail: <input type="email" id="myEmail" value="johndoe@example.com"> <p>Click the button to change the default value of the email field.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myEmail").defaultValue = "steve@w3schools.com"; } </script> </body> </html>