JSFiddle - React, Tailwind, and code Playground

HTML

<p><input id="one" type="radio" value="false" /></p>
<p><input id="two" type="radio" value="false" checked="checked" /></p>

JavaScript

var buttons = document.getElementsByTagName("input");

for (var i = 0; i <= buttons.length; i++) {
    var button = buttons[i];
    var id = button.getAttribute("id");
    var type = button.getAttribute("type");
    var value = button.getAttribute("value");
    var checked = button.getAttribute("checked");
    if (type === "radio" && value === "false" && checked === "checked") {
        alert(id);
    }
}