How to detect changes in the DOM with MutationObserver (copy & paste example)

CodeGrepper example:

I found a working Mutation Observer code example on CodeGrepper that allows one to observe changes in the DOM, or in a specific element.

Code:

const config = { childList: true, subtree: true };

const callback = function(mutationsList, observer) {
for(let mutation of mutationsList) {
// Elements have changed
}
}
};

const observer = new MutationObserver(callback);