See https://developers.google.com/speed/docs/insights/MinifyResources
npm install html-validate -g
npm install html-minifier -g
npm install uglify-js -g
npm install clean-css-cli -g
uglifyjs stats.js --validate cleancss html-minifier --minify-css true --minify-js true --minify-urls true --collapse-whitespace --conservative-collapse --remove-comments --decode-entities --case-sensitive --remove-optional-tags --sort-attributes --sort-class-name --trim-custom-fragments --use-short-doctype --remove-empty-attributes --remove-attribute-quotes index.html
brew install guumaster/tap/hostctl