crossfilterthe javascript mapreduce library figure starting up simple python http server make sure to have all the required files available in the same folder as your index html you can download them from the manning website or from their creatorswebsites dc css and dc min js-- min js--crossfilter min js--now we know how to run the code we're about to createso let' look at the index html pageshown in the following listing listing an initial version of index html all css is loaded here data science application main container incorporates everything visible to user make sure to have dc css downloaded from the manning download page or from the dc websitedc jsit must be present in the same folder as index html file data science application