cdnjs is a free distributed JS library delivery service.
Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.
HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web.
Pure CSS is a set of small, responsive CSS modules that can be used in web projects.
RequireJS is a JavaScript library and file loader which manages the dependencies between JavaScript files and in modular programming.
Unpkg is a content delivery network for everything on npm.