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<html>
<body>

<h2 style="color:green">Create a checkbox and get its value</h2>
<h3> Are you a web developer? </h3>
Yes: <input type="checkbox" id="myCheck1" value="Yes, I'm a web developer">
No: <input type="checkbox" id="myCheck2" value="No, I'm not a web developer">
<br> <br>
<button onclick="checkCheckbox()">Submit</button> <br>

<h4 style="color:green" id="result"></h3> 
<h4 style="color:red" id="error"></h3>

<script>
function checkCheckbox() {
  var yes = document.getElementById("myCheck1");
  var no = document.getElementById("myCheck2");
  if (yes.checked == true && no.checked == true){
    return document.getElementById("error").innerHTML = "Please mark only one checkbox either Yes or No";
  }
  else if (yes.checked == true){
    var y = document.getElementById("myCheck1").value;
    return document.getElementById("result").innerHTML = y; 
  } 
  else if (no.checked == true){
    var n = document.getElementById("myCheck2").value;
    return document.getElementById("result").innerHTML = n;
  }
  else {
    return document.getElementById("error").innerHTML = "*Please mark any of checkbox";
  }
}
</script>

</body>
</html>