Maybe I am mistaken but it seems to me that the stack is implemented with a Javascript. I am a bit disappointed, in the sense that the stack too could have been

Maybe I am mistaken but it seems to me that the stack is implemented with a Javascript. I am a bit disappointed, in the sense that the stack too could have been implemented as a a list of tags in the containing document. This would enable interesting features such as visual debugging (you just check the document to see the status of the program) and more importantly would enable the "code as data" paradigm, giving us easy metaprogramming and essentially a "lisp with brackets" (Yes, I am not being completely serious)