polymerelements/iron-collapse

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

Utility classes to make building demo pages easier

Web Components Polyfills

Generate TypeScript type declarations for Polymer components.

Common (global) styles for Material Design elements.

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

Coordinates the flow of resizeable elements

Formats your entire project with clang-format