title: how to validate radio button without javascript?
body: <p>I have used radio button for gender as follow:-</p>
  
  <pre><code>&lt;td&gt;&lt;input type="radio" name="gender" value="male" checked required="required"&gt; Male&lt;br&gt;
    &lt;input type="radio" name="gender" value="female"&gt; Female&lt;br&gt;
    &lt;input type="radio" name="gender" value="other"&gt; Other&lt;/td&gt;
  </code></pre>
  
  <p>but this "required" validation is not working how to put validation on it without using JavaScript. </p>