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<html><body>Radio button: <input type="radio" name="colors" id="myRadio" checked><p>Click the "Try it" button to find out if the radio button is checked by default.</p><button onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { var x = document.getElementById("myRadio").defaultChecked; document.getElementById("demo").innerHTML = x;}</script></body></html>