JSFiddle - React, Tailwind, and code Playground

HTML

<input type="radio" name="question" id="question_yes" value="Yes" checked="checked" />Yes<br>
<input type="radio" name="question" id="question_no" value="No" />No<br>
<br>
<button onclick="validate()">Validate</button>

JavaScript

var validate = function() {
    if (document.getElementById('question_yes').checked) {
        alert('yes');
    } else if(document.getElementById('question_no').checked) {
        alert('no');
    }
};