HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>copy log</title>
</head>
<body>
  <p id="article">Select some of this sentence and copy it.</p>
  <pre id="out">(waiting for copy)</pre>
  <script>
    var article = document.getElementById("article");
    var out = document.getElementById("out");
    article.addEventListener("copy", function () {
      var len = document.getSelection().toString().length;
      out.textContent = "Copied " + len + " character(s)";
    });
  </script>
</body>
</html>

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Element copy — log copy (Try It)