This website contains tracking information that allows admins to see Facebook Insights out of Facebook to this domain.
Anti-bot CAPTCHA widget that helps digitize books by providing snippets of books for people to enter the text for. Owned by Google.
RequireJS is a JavaScript file and module loader. It is optimized for in-browser use, but it can be used in other JavaScript environments, like Rhino and Node.
This site uses the viewport meta tag which means the content may be optimized for mobile content.
CloudFlare is a global CDN and DNS provider that can speed up and protect any site online.
VideoJS is an HTML5 Video Player, built with Javascript and CSS, with a fallback to a Flash video player for when the browser doesn't support HTML5 video.
nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
Allows a website to define how a page is rendered in Internet Explorer 8, allowing a website to decide to use IE7 style rendering over IE8 rendering.
The website contains Adobe Flash content embeded without the use of JavaScript.
UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.
This page contains a meta robots tag which tells search engines and robots to index or not index the page.
Meta descriptions are HTML attributes that provide concise explanations of the contents of web pages. Meta descriptions are commonly used on search engine result pages (SERPs) to display preview snippets for a given page.
The http-equiv attribute provides an HTTP header for the information/value of the content attribute. The http-equiv attribute can be used to simulate an HTTP response header.
A canonical link element is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical", or "preferred".
Open graph description entity tag
The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook