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Site Info - Epa.gov
Overview of web technologies used by Epa.gov.
United States Environmental Protection Agency | US EPA
Description on Homepage
Number 5,925 of all websites according to Alexa
Main visitors locations
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.
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.
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 strong ETag is an HTTP header field for validation of cached web pages, that indicates a byte-for-byte identical 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.
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/.
A weak ETag is an HTTP header field for validation of cached web pages, that indicates a semantically equivalent page in the cache.
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.
Generic RDFa (Resource Description Framework in attributes) is RDFa without further specialization.
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 Pinterest Pin-It button allows website visitors to pin images onto Pinterest.
The Google +1 button allows visitors to recommend web pages to friends.
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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