This seems useful. US Digital Services has designed standard UI for US.gov websites. Check out the quote. Think of the opportunities for creating better access for citizens.
Code: We wanted to create a single reference point for developers in need of common patterns; think about it in terms of building blocks of code for teams assembling websites. Because our goal was to build a system of components shaped by modern best practices, we included code samples in all of our standards and made sure code was 508-compliant and accessible. We also knew that in order for our code to be easy to read and readily adoptable, it had to have a unified voice. After speaking with dozens of frontend developers and designers in government, we sought to strike a balance between modular CSS and code that’s clean and easy-to-use.