HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>selectstart scoped</title>
  <style>
    #protect { padding: 8px; border: 1px solid #888; }
  </style>
</head>
<body>
  <div id="protect">
    <p>Select text inside this box.</p>
  </div>
  <p>Selecting this outside text should not update the log.</p>
  <pre id="out">Waiting...</pre>
  <script>
    var out = document.getElementById("out");
    var box = document.getElementById("protect");
    box.addEventListener("selectstart", function (event) {
      out.textContent =
        "selectstart inside #protect\n" +
        "target: " + event.target.nodeName;
    });
  </script>
</body>
</html>

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Node selectstart — scoped (Try It)