Scittle

      
<head>
  <script src="https://borkdude.github.io/scittle/js/scittle.js" type="application/javascript"></script>

  <script type="application/x-scittle">
    (defn my-alert []
      (js/alert "You clicked!"))

    ;; export function to use from JavaScript:
    (set! (.-my_alert js/window) my-alert)
  </script>

</head>

<body>
  <button onclick="my_alert()">
    Click me!
  </button>
</body>