Post #1381764

A common mistake with a 'subtree' MutationObserver is assuming addedNodes includes all newly connected nodes, but it doesn't include preexisting children of the added nodes https://codepen.io/editor/jaffathecake/pen/019d90a5-98e5-7d08-b85f-630c9257cfad?console=true&file=%2Fscript.js&orientation=left&show=split