JSFiddle - React, Tailwind, and code Playground

by Pavlo

JavaScript

var obs = new MutationObserver(function(mutations, observer){
                if( mutations[0].addedNodes.length)
                    alert('added nodes '+mutations[0].addedNodes.length)
            });
obs.observe( document, { childList:true, subtree:false });
$('<textarea></textarea>').appendTo('body');