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<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>