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<html><body><form action="/action_page.php"> Radio Button: <input type="radio" id="myRadio" name="test" required> <input type="submit"></form><p>Click the "Try it" button to find out if the radio button must be checked before submitting the form.</p><button onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { var x = document.getElementById("myRadio").required; document.getElementById("demo").innerHTML = x;}</script></body></html>