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<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>