HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>currentCSSZoom nested</title>
</head>
<body>
  <div id="parent">
    parent
    <div style="zoom:2" id="child1">
      child1
      <div style="zoom:3" id="child2">child2</div>
    </div>
  </div>
  <pre id="out"></pre>
  <script>
    var out = document.getElementById("out");
    if ("currentCSSZoom" in Element.prototype) {
      out.textContent = String(document.getElementById("child2").currentCSSZoom);
    } else {
      out.textContent = "not supported";
    }
  </script>
</body>
</html>

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Element.currentCSSZoom — nested (Try It)