How the Web works

Viewing a Web page or other resource on the World Wide Web normally begins either by typing the URL of the page into a Web browser, or by following a hypertext link to that page or resource. The first step, behind the scenes, is for the server-name part of the URL to be resolved into an IP address by the global, distributed Internet database known as the Domain name system or DNS. The browser then establishes a TCP connection with the server at that IP address.

Source: http://en.wikipedia.org/wiki/World_Wide_Web

Assistive technologies

In addition to dedicated Web content user agents, a wide range of assistive technologies is available to help people with computer accessibility. These technologies can greatly assist access to Web content for people with disabilities. Examples include:

Source: http://en.wikipedia.org/wiki/Web_accessibility

W3C recommendation

The first CSS specification to become an official W3C Recommendation is CSS level 1, published in December 1996.[3] Among its capabilities are support for:

Source: http://en.wikipedia.org/wiki/Cascading_Style_Sheets

Atom

In reaction to recognized issues with RSS (and because RSS 2.0 is frozen), a third group began a new syndication specification, Atom, in June 2003. Their work was later adopted by the Internet Engineering Task Force (IETF) leading to the publication of a specification (RFC 4287) for the Atom Format in 2005. Work on the Atom Publishing Protocol, a standards-based protocol for posting to publishing tools is ongoing.

Source: http://en.wikipedia.org/wiki/RSS_%28file_format%29

The current status of RIA development and adoption

RIAs are still in the early stages of development and user adoption. There are a number of restrictions and requirements that remain:

Source: http://en.wikipedia.org/wiki/Rich_Internet_application

DOCTYPEs

In order to validate an XHTML document, a Document Type Declaration (or DOCTYPE) may be used. A DOCTYPE declares to the browser which Document Type Definition (DTD) the document conforms to. A Document Type Declaration should be placed before the root element.

Source: http://en.wikipedia.org/wiki/XHTML

Google Mars

Google Mars provides a visible imagery view, like Google Moon, as well as infrared imagery and shaded relief (elevation). Users can toggle between the elevation, visible, and infrared data, in the same manner as switching between map, satellite, and hybrid modes of Google Maps. In collaboration with NASA scientists at Arizona State University, Google has provided the public with data collected from two NASA Mars missions, Mars Global Surveyor and 2001 Mars Odyssey.[19] At present, the Google Earth desktop client cannot access the data, but the feature is in development.

Source: http://en.wikipedia.org/wiki/Google_Maps