HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>currentScript dataset</title>
</head>
<body>
  <pre id="out"></pre>
  <script data-theme="dark" data-api="/v1">
    var cfg = document.currentScript.dataset;
    document.getElementById("out").textContent =
      "theme: " + cfg.theme + "\n" +
      "api: " + cfg.api;
  </script>
</body>
</html>

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Document.currentScript — data attributes (Try It)