Browser side CSS abstract syntax tree generator. (Javascript but Not node)

I'm looking for a client-side standalone javascript library (if it runs on node then i can't use it) that consumes a string of text (that has valid CSS) and produces a css Abstract Syntax Tree. Something like JavaScript AST visualizer: http://jointjs.com/demos/javascript-ast but for css.

It has to be client side standlone javascript, not NODE.

Thanks in advance for all your answers!!