HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>afterscriptexecute listener</title>
</head>
<body>
  <pre id="out">Waiting...</pre>
  <script>
    var out = document.getElementById("out");
    var lines = [];
    function log(msg) {
      lines.push(msg);
      out.textContent = lines.join("\n");
    }

    document.addEventListener("afterscriptexecute", function (event) {
      log("afterscriptexecute fired");
      log("target: " + (event.target && event.target.nodeName));
    });

    log("Listener attached (event may never fire in modern browsers)");

    var s = document.createElement("script");
    s.textContent = "/* injected */";
    document.body.appendChild(s);
    log("Injected an inline script");
  </script>
</body>
</html>

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Element afterscriptexecute — addEventListener (Try It)