HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Leadfeeder is a B2B visitor identification software that tracks and identifies companies that visit your website.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Priority Hints exposes a mechanism for developers to signal a relative priority for browsers to consider when fetching resources.
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.