old_contents: obj = {a: 1, b: 2}
  s = new ClSimplexSolver();
  always: { solver: s
  	obj.a + 7 <= obj.b
  }
  obj.a = 10;
  console.log("loaded JavaScript", obj.a, obj.b);
  
new_contents: document.addEventListener('babelsbergready', function () {
      console.log("all bbbscripts compiled");
  });
  
  obj = {a: 1, b: 2}
  s = new ClSimplexSolver();
  always: { solver: s
          obj.a + 7 <= obj.b
  }
  obj.a = 10;
  console.log("loaded JavaScript", obj.a, obj.b);
  
subject: extend example to test event