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<html><body><form>Username: <input type="text" id="usrname"><br>Password: <input type="password" id="myPsw"></form><br><button onclick="disablePsw()">Disable Password field</button><button onclick="undisablePsw()">Undisable Password field</button><script>function disablePsw() { document.getElementById("myPsw").disabled = true;}function undisablePsw() { document.getElementById("myPsw").disabled = false;}</script></body></html>