How to detect CSS3 resize events

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Resizing is like a style change. As such it can be observed with a MutationObserver. The more specific ResizeObserver is probably even better:

let observer = new ResizeObserver(function(mutations) {
  console.log('mutations:', mutations);
});

let child = document.querySelector('textarea');
observer.observe(child, { attributes: true });
<textarea></textarea>

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