HTML Code

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

    document.addEventListener("beforescriptexecute", function (e) {
      log("beforescriptexecute for: " + (e.target && e.target.id));
    });

    var dynamic = document.createElement("script");
    dynamic.id = "dynamic-demo";
    dynamic.textContent = "/* dynamic */";
    document.body.appendChild(dynamic);

    log("Dynamic script appended");
    log("MDN: beforescriptexecute skips dynamically added scripts");
    log("Prefer CSP / trusted loading instead");
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

Document beforescriptexecute — static vs dynamic (Try It)