cdnjs is a free distributed JS library delivery service.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Netlify providers hosting and server-less backend services for web applications and static websites.
Paddle is a billing and payment gateway for B2B SaaS companies.
Polyfill is a service which accepts a request for a set of browser features and returns only the polyfills that are needed by the requesting browser.