HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
HTML5 Media enables video and audio tags in all major browsers.
Modernizr is a JavaScript library that detects the features available in a user's browser.
PHP is a general-purpose scripting language used for web development.
Prototype is a JavaScript Framework that aims to ease development of web applications.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.