---- Polymer 3.0 ---- brew install yarn npm install -g polymer-cli yarn init yarn add @polymer/polymer@next yarn add @polymer/paper-elements

---- Polymer 2.0 ---- -- As root -- npm install -g polymer-cli --unsafe-perm

-- As regualar user -- bower install --save Polymer/polymer#^2.0.0 bower install --save PolymerElements/paper-input bower install --save PolymerElements/paper-button bower install --save PolymerElements/iron-form