JSFiddle - React, Tailwind, and code Playground

by tdecs

HTML

<div id="div1">
  <ul>
    <li>uno</li>
    <li id="li_dos">dos</li>
  </ul>
</div>

<div id="div2">div2</div>

JavaScript

// mi jQuery
function $(id) {
  return document.getElementById(id);
}

var div1 = $('div1'),
  div2 = $('div2'),
  li_dos = $('li_dos');

alert('div1 contiene a li_dos? ' + div1.contains(li_dos)); // true

alert('div1 contiene a div2? ' + div1.contains(div2)); // false