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Site Info - Epa.gov
Overview of web technologies used by Epa.gov.
United States Environmental Protection Agency | US EPA
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Drupal is an open source content management system written in PHP, originally developed by Dries Buytaert.
PHP is a popular scripting language for creating web pages.
ColdFusion is a scripting language used for building web applications, and developed by Adobe Systems.
Perl is a general-purpose, interpreted language, nowadays also used to create web pages.
HTML - Hypertext Mark-up Language - is a language to define web pages.
HTML5 is the fifth revision of the HTML standard.
UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding for Unicode, which is backwards compatible with ASCII.
JPEG (Joint Photographic Experts Group) is a lossy compression method suitable to store photographic images.
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.
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.
Inline Cascading Style Sheets define style rules directly within an (X)HTML element using the style attribute.
Gzip (GNU zip) is a file compression algorithm.
A weak ETag is an HTTP header field for validation of cached web pages, that indicates a semantically equivalent page in the cache.
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 Strict Transport Security (HSTS) defines a mechanism enabling web sites to declare themselves accessible only via secure connections.
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.
DigiCert is an SSL certificate authority. This includes Verizon, whose Enterprise SSL Business has been acquired by DigiCert.
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.
The Google +1 button allows visitors to recommend web pages to friends.
The Pinterest Pin-It button allows website visitors to pin images onto Pinterest.
CrazyEgg is a website visitor and click tracking service.
The Google Tag Manager is a Google service to support webmasters to manage tags on their websites.
The Apache HTTP Server is a popular open source web server by the Apache Software Foundation.
Akamai is a content delivery network.
United States Government
The technology score rates a site based on its technologies in a range from 0 to 100. It consists in a popularity score (how many sites use the same technologies), a traffic score (how much traffic have other sites using the same technologies) and a version score (how many sites use more recent technology versions). Quality alerts also affect the rating.
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