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.
Typeform is a Spanish online software as a service (SaaS) company that specialises in online form building and online surveys.
Vercel is a cloud platform for static frontends and serverless functions.