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<html><body><form action="/action_page.php" method="get"> Username: <input type="text" name="usr_name"> Encryption: <keygen id="myKeygen" name="security"> <input type="submit"></form><br><button onclick="disableKey()">Disable Keygen field</button><button onclick="undisableKey()">Undisable Keygen field</button><script>function disableKey() { document.getElementById("myKeygen").disabled = true;}function undisableKey() { document.getElementById("myKeygen").disabled = false;}</script></body></html>