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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<div id="recursive"></div>
</body>
</html>
 
#recursive {
  width: 100px;
  height: 100px;
  background: black;
}
 
const target = document.querySelector('#recursive');
const observer = new ResizeObserver(([entry]) => {
  if(entry.contentRect.width < 1000) {
    target.style.width = entry.contentRect.width + 10 + 'px'
  }
});
observer.observe(target);
target.style.width = '200px'
//window.onerror = msg => console.warn(msg)
Output 300px

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