d3

 brew install n

 n lts

 sudo n lts

 node --version

 npm --version

 mkdir d3-project

 cd d3-project

 npm init -y

 npm install "babel-core@^6" "babel-loader@^6" "babel-preset-es2017@^6" "babel-preset-stage-0@^6" "webpack@^2" "webpack-dev-server@^2" css-loader style-loader json-loader --save-dev

python -m http.server 8000

Collapsible Tee -
https://bl.ocks.org/mbostock/4339083