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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 governmentThe Internal Revenue Service is the nation's tax collection agency and administers the Internal Revenue Code enacted by Congress.
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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.
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.
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.
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/.
Persistent cookies with an expiration time of up to 1 day.
HttpOnly cookies are used only in the HTTP protocol and not in client side scripts, which may increase security.
Secure cookies are used only via an encrypted connections, which may increase security.
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.
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.
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