JSFiddle - React, Tailwind, and code Playground

HTML

<select>
    <option value="1" selected="selected">One</option>
    <option value="2">Two</option>
  </select>

  <button onclick="javascript:alert($('input,select :selected').length)">
    test
  </button>

JavaScript

// #8468, Opera selector issues

$("body").append(
    "<div>$('input,select :selected') selects "+
    $('input,select :selected').length + " elements.</div>"
);
$("body").append(
    "<div>$('select :selected') selects "+
    $('select :selected').length + " elements.</div>"
);
$("body").append(
    "<div>$('input') selects "+
    $('input').length + " elements.</div>"
);