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<!DOCTYPE html> <html> <body> First Name: <input type="text" id="myText" value="Mickey"><br> <button onclick="disableTxt()">Disable Text field</button> <button onclick="undisableTxt()">Undisable Text field</button> <script> function disableTxt() { document.getElementById("myText").disabled = true; } function undisableTxt() { document.getElementById("myText").disabled = false; } </script> </body> </html>