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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>elementsFromPoint MDN</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;margin:0;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <div>
    <p>Some text</p>
  </div>
  <p>Elements at point 30, 20:</p>
  <div id="output"></div>
  <button id="btn" type="button">Run hit test</button>
  <pre id="log">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var output = document.getElementById("output");
      output.textContent = "";
      if (document.elementsFromPoint) {
        var elements = document.elementsFromPoint(30, 20);
        elements.forEach(function (elt, i) {
          output.textContent += elt.localName;
          if (i < elements.length - 1) {
            output.textContent += " < ";
          }
        });
        document.getElementById("log").textContent = output.textContent;
      } else {
        document.getElementById("log").textContent = "elementsFromPoint not supported";
      }
    });
  </script>
</body>
</html>

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Document.elementsFromPoint — MDN stack string (Try It)