Act! Web Components
The Act! Web Component library is a set of standards driven front-end elements that are utilized within the Act! application and shared for consumption for Act! Development Partners.
These elements look and feel like native HTML5 elements while utilizing the latest in browser technology to deliver a truly simple, yet robust library of front-end elements. Check out the Mozilla Developer Network (MDN) documentation on Web Components to get an in depth look at what web components are and how they are built.
Be sure to check out the full web component documentation.