Please note: this is based on Polymer 1.0, and will be gradually updated to 2.0 once it is released properly.
This repo demonstrates the creation and usage of basic Polymer Elements.
Install the Polymer CLI:
npm install -g polymer-cli
This can take a while because it has many dependencies and installs Selenium.
From the repo folder, start the Polymer server:
polymer serve
Then visit localhost:8080.