wow this reminds me some years ago I toyed with a mash-up language for the web. The whole idea was attempt to combine css declarations vs js imperative.. code looked like this.

  <script type="text/x-dont-remember-what">

  .button:click {
    this.addClass('foo');
  }
    
  #foo a:click(e) {
    this.hide();
    parent.show();
    e.stopPropagation();
  }
  </script>