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<!DOCTYPE html> <html> <body> E-mail: <input type="email" id="myEmail"><br><br> <button onclick="disableBtn()">Disable Email Field</button> <button onclick="undisableBtn()">Undisable Email Field</button> <script> function disableBtn() { document.getElementById("myEmail").disabled = true; } function undisableBtn() { document.getElementById("myEmail").disabled = false; } </script> </body> </html>