How to detect element being added/removed from dom element?

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Don’t use mutation events like DOMNodeInserted and DOMNodeRemoved.

Instead, use DOM Mutation Observers, which are supported in all modern browsers except IE10 and lower (Can I use). Mutation observers are intended to replace mutation events (which have been deprecated), as they have been found to have low performance due to flaws in its design.

var x = new MutationObserver(function (e) {
  if (e[0].removedNodes) console.log(1);
});

x.observe(document.getElementById('parent'), { childList: true });

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