Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
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.
Svelte is a free and open-source front end compiler created by Rich Harris and maintained by the Svelte core team members.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.