JSFiddle - React, Tailwind, and code Playground
HTML
<div id="parent">
Parent
<div id="child">
Child
<div id="grandChield">GrandChield</div>
</div>
<div id="sibling">
Sibling 1
</div>
</div>
JavaScript
function clg(target) {
console.log(target);
}
clg( $.contains('#parent', '#sibling') );