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Result Size: 625 x 571
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<!DOCTYPE html>
<html>
<body>
<form action="https://www.w3schools.com/action_page.php">
  Radio Button: <input type="radio" id="myRadio" name="test">
  <input type="submit">
</form>
<p>Click the "Try it" button to set the required property for the radio button.</p>
<p><strong>Tip:</strong> Click the "Submit" button before and after you have clicked the "Try it" button, to see the effect.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  document.getElementById("myRadio").required = true;
  document.getElementById("demo").innerHTML = "The required property was set. The radio button must now be checked before submitting the form.";
}
</script>
</body>
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_radio_required2 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:17:19 GMT -->
</html>
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