This talk overviews our web platform for big data visualization (Superconductor). It focuses on one of the core components: our domain specific language for writing custom layouts. We took a new look at the old idea of attribute grammars: I'll show live examples of writing attribute grammars, automatically finding parallelism in them, and then automatically compiling them down into efficient parallel JavaScript code that runs on GPUs. See http://www.sc-lang.com for more. The video (which includes live demos) will be up in a couple of weeks. Thanks for Functional Monthly for hosting!