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Site Info - Cdc.govOverview of web technologies used by Cdc.gov. Website Background Centers for Disease Control and Prevention | CDC Description on Homepage Top 10k among all websites Popularity rank Drupal is an open source content management system written in PHP, originally developed by Dries Buytaert. Drupal 7 PHP is a scripting language for creating websites. PHP Microsoft's Active Server Pages technology on the .NET framework. ASP.NET JavaScript is a lightweight, object-oriented, cross-platform scripting language, often used within web pages. jQuery is a JavaScript library that simplifies HTML document traversing, event handling, animating and Ajax interaction. Originally developed by John Resig. Bootstrap is an open source HTML, CSS, and JavaScript framework. Bootstrap is an open source HTML, CSS, and JavaScript framework. Bootstrap The Apache HTTP Server is an open source web server by the Apache Software Foundation. Apache 2.4.62 Amazon is a US-based e-commerce and cloud computing provider. Amazon Amazon is a US-based e-commerce and cloud computing provider. Amazon Akamai is a content delivery network. This includes the former brands Instart Logic and StackPath. DigiCert is an SSL certificate authority. This includes Verizon, whose Enterprise SSL Business has been acquired by DigiCert. Entrust is an IT security service provider, also operating as SSL certificate authority. Entrust Google Analytics is a free service to get detailed statistics about the visitors of a website, provided by Google. This includes the Ads conversion tracking and the Floodlight services. Google Analytics Adobe Analytics is a web site traffic analysis service formerly called Omniture. Its products include SiteCatalyst, WebSideStory and Hitbox. Adobe Analytics The Google Advertising network consists of AdSense, DoubleClick and other services. Google Ads The Google Tag Manager is a Google service to support webmasters to manage tags on their websites. Google Tag Manager Facebook Social Plugins provide a way for Facebook users to share web pages with their friends.
A Twitter Button allows a Twitter user to post a tweet from the visited site.
LinkedIn Share Buttons enable visitors to to share website content with their LinkedIn network.
External Cascading Style Sheets define style rules in a separate CSS file. Embedded Cascading Style Sheets define a set of style rules in a <style> element within a web page. Embedded CSS Inline Cascading Style Sheets define style rules directly within an (X)HTML element using the style attribute. Inline CSS Session cookies are temporary cookies, which are deleted when the user closes the browser. Persistent cookies with an expiration time between 1 and 10 years. HttpOnly cookies are used only in the HTTP protocol and not in client side scripts, which may increase security. HttpOnly Cookies Non-HttpOnly cookies are used in the HTTP protocol and also in client side scripts, which may be a security threat. Secure cookies are used only via an encrypted connections, which may increase security. Non-secure cookies may be used via an unencrypted connections, which may be a security threat. Gzip (GNU zip) is a file compression algorithm. A strong ETag is an HTTP header field for validation of cached web pages, that indicates a byte-for-byte identical page in the cache. Strong ETag The Internet Protocol version 6 (IPv6) provides amongst others a vastly larger address space than the preceding version 4. We consider a website to support IPv6 if a 128-bit address is assigned to it, regardless of the content delivered at that address. HTTP/2 is the second major version of the HTTP network protocol. HTTP Strict Transport Security (HSTS) defines a mechanism enabling web sites to declare themselves accessible only via secure connections. HTTP Strict Transport Security The websites redirects visitors to its www subdomain, e.g. from example.com to www.example.com. The websites redirects visitors to use SSL encryption, e.g. from http://example.com/ to https://example.com/. The Open Graph protocol, originally developed by Facebook, is an RDFa-based format that enables any web page to become a rich object in a social graph. Twitter Cards enable automatic attachment of photos, videos and media elements to Tweets. Generic RDFa (Resource Description Framework in attributes) is RDFa without further specialization. The Dublin Core Schema is a set of vocabulary terms that can be used to describe web resources and physical resources. JSON-LD (JavaScript Object Notation for Linked Data) is a method of encoding Linked Data using JSON.
Microdata is a specification to integrate metadata within existing content on web pages.
HTML5 is the fifth revision of the HTML standard. XHTML+RDFa (Extensible Hypertext Markup Language + Resource Description Framework in attributes) is an extended version of the XHTML markup language for supporting RDF. XHTML+RDFa 1.0 UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding for Unicode, which is backwards compatible with ASCII. PNG (Portable Network Graphics) is a lossless compression image format, suitable to store graphics with uniformly colored areas, and originally introduced as a free, open-source successor of GIF. JPEG (Joint Photographic Experts Group) is a lossy compression method suitable to store photographic images. Scalable Vector Graphics (SVG) is an XML-based vector image format. United States Government
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