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Site Info - Irs.gov
Overview of web technologies used by Irs.gov.
Internal Revenue Service | An official website of the United States government
Description on Homepage
Number 482 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.
Java is a general-purpose language originally developed by Sun Microsystems.
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.
Scalable Vector Graphics (SVG) is an XML-based vector image format.
External Cascading Style Sheets define style rules in a separate CSS file.
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/.
HTTP/2 is the second major version of the HTTP network protocol.
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.
Entrust is an IT security service provider, also operating as SSL certificate authority.
The SSL certificate is invalid because it is not issued for the domain where it is used.
A Twitter Button allows a Twitter user to post a tweet from the visited site.
AddToAny is a social bookmarking and sharing service.
New Relic is a web application performance management tool.
The Google Tag Manager is a Google service to support webmasters to manage tags on their websites.
Akamai is a content delivery network.
United States Government
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