polymerelements/iron-selector

The Polymer library makes it easy to create your own web components. Give your element some markup and properties, and then use it on a site. Polymer provides features like dynamic templates and data binding to reduce the amount of boilerplate you need to write

Formats your entire project with clang-format

Utility classes to make building demo pages easier

Utility classes to help make testing easier

Client-side dependencies for web-component-tester tests installed via npm.

Web Components Polyfills

Generate TypeScript type declarations for Polymer components.

Common (global) styles for Material Design elements.