JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" checked="checked" />
<input type="checkbox" />
<br />
<a id="clicker">Click Me</a>

<div id="divOut"></div>

JavaScript

$('#clicker').bind('click', function () {
    var checked = $("input:checked");
    $('#divOut').html($('#divOut').html() + "<br/>the size of input:checked is " + checked.size() + "<br/>the length is " + checked.length);
}).click();