HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Progressive Web Apps (PWAs) are web apps built and enhanced with modern APIs to deliver enhanced capabilities, reliability, and installability while reaching anyone, anywhere, on any device, all with a single codebase.
RxJS is a reactive library used to implement reactive programming to deal with async implementation, callbacks, and event-based programs.
Vercel is a cloud platform for static frontends and serverless functions.