In-depth analysis of www.youtube.com

Fonts

Google Fonts

Google Fonts is a free and open-source library of web fonts provided by Google.

HSTS

HSTS (HTTP Strict Transport Security) is a security mechanism that forces browsers to only connect to a website over HTTPS.
reCaptcha

Google reCAPTCHA is a free CAPTCHA service that helps protect websites from spam and abuse.

Gzip

Gzip compression is a lossless data compression algorithm used to reduce file sizes.
HTTP/3

HTTP/3 is the third major version of the Hypertext Transfer Protocol (HTTP), the foundation of data communication for the World Wide Web. It is a successor to HTTP/2 and uses the QUIC protocol, which is a multiplexed, secure, and connection-oriented transport protocol.
OpenGraph

OpenGraph is an open standard that allows you to add metadata to your website so that it can be better understood by social media platforms and other websites.
OpenSearch

The OpenSearch description format can be used to describe the web interface of a search engine. This allows a website to describe a search engine for itself, so that a browser or other client application can use that search engine.
Progressive Web App

Websites which support Progressive Web App (PWA) use modern web technologies to deliver an app-like experience to users.