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<!DOCTYPE html>
<html>
<body>
​
<form>
<input type="button" id="btn01" value="OK">
</form>
​
<p>Click the "Disable" button to disable the "OK" button:</p>
​
<button onclick="disableElement()">Disable</button>
​
<script>
function disableElement() {
  document.getElementById("btn01").disabled = true;
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_button_disabled by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:40:21 GMT -->
</html>
​
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