HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>selectstart listener</title>
</head>
<body>
  <p id="sample">Drag to select this text and watch the log below.</p>
  <pre id="out">Waiting for selectstart...</pre>
  <script>
    var out = document.getElementById("out");
    document.addEventListener("selectstart", function () {
      out.textContent = "Selection started";
    });
  </script>
</body>
</html>

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Node selectstart — addEventListener (Try It)