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Please do not link to this page, reference it, or quote it because it is an unapproved draft and some of the information is out-of-date.
This document provides an introduction to use of the Web by people with disabilities. It illustrates some of their requirements when using Web sites and Web-based applications, and provides supporting information for the guidelines and technical work of the World Wide Web Consortium's (W3C) Web Accessibility Initiative (WAI).
This document version is a W3C Working Draft intended for eventual publishing as a W3C Note. It may be superseded by a later version maintained at the W3C. This document is issued by the Education and Outreach Working Group (EOWG) as part of the WAI International Program Office Activity. Comments from the public, W3C Members, and working groups are welcome at email@example.com. A list of current W3C technical reports and publications including working drafts and notes can be found at http://www.w3.org/TR/.
The Web Accessibility Initiative (WAI) develops guidelines for accessibility of Web sites, browsers, and authoring tools, in order to make it easier for people with disabilities to use the Web. Given the Web's increasingly important role in society, access to the Web is vital for people with disabilities. Many of the accessibility solutions described in WAI materials also benefit Web users who do not have disabilities.
This document provides a general introduction to how people with different kinds of disabilities use the Web. It provides background to help understand how people with disabilities benefit from provisions described in the Web Content Accessibility Guidelines 1.0, Authoring Tool Accessibility Guidelines 1.0, and User Agent Accessibility Guidelines 1.0. It is not a comprehensive or in-depth discussion of disabilities, nor of the assistive technologies used by people with disabilities. Specifically, this document describes:
This document contains many internal hypertext links between the sections on scenarios, disability requirements, assistive technologies, and scenario references. The scenario references and general references sections also include links to external documents.
The following scenarios show people with different kinds of disabilities using assistive technologies and adaptive strategies to access the Web. In some cases the scenarios show how the Web can make some tasks easier for people with disabilities.
Please note that the scenarios do not represent actual individuals, but rather individuals engaging in activities that are possible using today's Web technologies and assistive technologies. The reader should not assume that everyone with a similar disability to those portrayed will use the same assistive technologies or have the same level of expertise in using those technologies. In some cases, browsers, media players, or assistive technologies with specific features supporting accessibility may not yet be available in an individual's primary language. Disability terminology varies from one country to another, as do educational and employment opportunities.
Each scenario contains links to additional information on the specific disability or disabilities described in more detail in Section 3; to the assistive technology or adaptive strategy described in Section 4; and to detailed curriculum examples or guideline checkpoints in the Scenarios References in Section 6.
Following is a list of scenarios and accessibility solutions:
Mr. Lee wants to buy some new clothes, appliances, and music. As he frequently does, he is spending an evening shopping online. He has one of the most common visual disabilities for men: color blindness, which in his case means an inability to distinguish between green and red.
He has difficulty reading the text on many Web sites. When he first
starting using the Web, it seemed to him the text and images on a lot
of sites used poor
color contrast, since they appeared to use similar shades of
brown. Eventually he realized that many sites were using colors that
were indistinguishable to him because of his
red/green color blindness. In some cases the site instructions
explained that discounted prices
were indicated by red text, but all of the text looked brown to him. In
other cases, the required fields on forms were indicated by red text,
but again he could not tell which fields had red text.
Mr. Lee found that he prefered sites that used sufficient
color contrast, or redundant information for color. The sites did
including names of the colors of clothing as well as showing a sample
of the color; and by placing an asterix (*) in front of the required
fields in addition to indicated them by color.
After additional experimentation, Mr. Lee discovered that on some
sites the colors were controlled by style
sheets and that he could turn these style
sheets off with his browser or override them
with his own style sheets. But on sites that did not use style
sheets he couldn't override the colors.
Eventually Mr. Lee bookmarked a series of online shopping sites
where he could get reliable information on product colors, and not have
to guess at which items were discounted.
Mr. Jones is a reporter who must submit his articles in HTML for publishing in an on-line journal. Over his twenty-year career, he has developed repetitive stress injury (RSI) in his hands and arms, and it has become painful for him to type. He uses a combination of speech recognition and an alternative keyboard to prepare his articles, but he doesn't use a mouse. It took him several months to become sufficiently accustomed to using speech recognition to be comfortable working for many hours at a time. There are some things he has not worked out yet, such as a sound card conflict that arises whenever he tries to use speech recognition on Web sites that have streaming audio.
He has not been able to use the same Web authoring software as his colleagues, because the application that his office chose for a standard is missing many of the keyboard equivalents that he needs in place of mouse-driven commands. To activate commands that do not have keyboard equivalents, he would have to use a mouse instead of speech recognition or typing, and this would re-damage his hands at this time. He researched some of the newer versions of authoring tools and selected one with full keyboard support. Within a month, he discovered that several of his colleagues have switched to the new product as well, after they found that the full keyboard support was easier on their own hands.
When browsing other Web sites to research some of his articles, Mr. Jones likes the access key feature that is implemented on some Web pages. It enables him to shortcut a long list of links that he would ordinarily have to tab through by voice, and instead go straight to the link he wants.
Ms. Martinez is taking several distance learning courses in physics. She is deaf. She had little trouble with the curriculum until the university upgraded their on-line courseware to a multimedia approach, using an extensive collection of audio lectures. For classroom-based lectures the university provided interpreters; however for Web-based instruction they initially did not realize that accessibility was an issue, then said they had no idea how to provide the material in accessible format. She was able to point out that the University was clearly covered by a policy requiring accessibility of online instructional material, and then to point to the Web Content Accessibility Guidelines 1.0 as a resource providing guidance on how to make Web sites, including those with multimedia, accessible.
The University had the lectures transcribed and made this information available through their Web site along with audio versions of the lectures. For an introductory multimedia piece, the university used a SMIL-based multimedia format enabling synchronized captioning of audio and description of video. The school's information managers quickly found that it was much easier to comprehensively index the audio resources on the accessible area of the Web site, once these resources were captioned with text.
The professor for the course also set up a chat area on the Web site where students could exchange ideas about their coursework. Although she was the only deaf student in the class and only one other student knew any sign language, she quickly found that the Web-based chat format, and the opportunity to provide Web-based text comments on classmates' work, ensured that she could keep up with class progress.
Ms. Laitinen is an accountant at an insurance company that uses Web-based formats over a corporate intranet. She is blind. She uses a screen reader to interpret what is displayed on the screen and generate a combination of speech output and refreshable braille output. She uses the speech output, combined with tabbing through the navigation links on a page, for rapid scanning of a document, and has become accustomed to listening to speech output at a speed that her co-workers cannot understand at all. She uses refreshable braille output to check the exact wording of text, since braille enables her to read the language on a page more precisely.
Much of the information on the Web documents used at her company is in tables, which can sometimes be difficult for non-visual users to read. However, since the tables on this company's documents are marked up clearly with column and row headers which her screen reader can access, she easily orients herself to the information in the tables. Her screen reader reads her the alternative text for any images on the site. Since the insurance codes she must frequently reference include a number of abbreviations and acronyms, she finds the expansions of abbreviations and acronyms the first time they appear on a page allows her to better catch the meaning of the short versions of these terms.
As one of the more senior members of the accounting staff, Ms. Laitenen must frequently help newer employees with their questions. She has recently upgraded to a browser that allows better synchronization of the screen display with audio and braille rendering of that information. This enables her to better help her colleagues, since the screen shows her colleagues the same part of the document that she is reading with speech or braille output.
Ms. Olsen attends middle school, and particularly likes her literature class. She has attention deficit disorder with dyslexia, and the combination leads to substantial difficulty reading. However with recent accommodations to the curriculum she has become enthusiastic about this class.
Her school recently started to use more online curricula to supplement class textbooks. She was initially worried about reading load, since she reads slowly. But recently she tried text to speech software, and found that she was able to read along visually with the text much more easily when she could hear certain sections of it read to her with the speech synthesis, instead of struggling over every word.
Her classes recent area of focus is Hans Christian Andersen's writings, and she has to do some research about the author. When she goes onto the Web, she finds that some sites are much easier for her to use than others. Some of the pages have a lot of graphics, and those help her focus in quickly on sections she wants to read. In some cases, though, where the graphics are animated, it is very hard for her to focus, and so it helps to be able to freeze the animated graphics.
One of the most important things for her has been the level of accessibility of the Web-based online library catalogues and the general search functions on the Web. Sometimes the search options are confusing for her. Her teacher has taught a number of different search strategies, and she finds that some sites provide options for a variety of searching strategies and she can more easily select searching options that work well for her.
He uses a screen magnifier to help with his vision and his hand tremor; when the icons and links on Web pages are bigger, it's easier for him to select them, and so he finds it easier to use pages with style sheets. When he first started using some of the financial pages, he found the scrolling stocktickers distracting, and they moved too fast for him to read. In addition, sometimes the pages would update before he had finished reading them. Therefore he tends to use Web sites that do not have a lot of movement in the text, and that do not auto-refresh. He also tended to "get stuck" on some pages, finding that he could not back up, on some sites where new browser windows would pop open without notifying him.
Mr. Yunus has gradually found some sites that work well for him, and developed a customized profile at some banking, grocery, and clothing sites.
Mr. Sands has put groceries in bags for customers for the past year
a supermarket. He has Down syndrome, and has
difficulty with abstract concepts, reading, and doing mathematical
usually buys his own groceries at this supermarket, but sometimes finds
that there are so many product choices that he becomes confused, and he
finds it difficult
track of how much he is spending. He has difficulty re-learning where
favorite products are each time the supermarket changes the layout of
Recently, he visited an online grocery service from his computer at
home. He explored the site the first few times with a friend. He
he could use the Web site without much difficulty -- it
a lot of pictures, which were helpful in navigating around the
in recognizing his favorite brands.
His friend showed him different search options that were available on the site, making it easier for him to find items. He can search by brand name or by pictures, but he mostly uses the option that lets him select from a list of products that he has ordered in the past. Once he decides what he wants to buy, he selects the item and puts it into his virtual shopping basket. The Web site gives him an updated total each time he adds an item, helping him make sure that he does not overspend his budget.
The marketing department of the online grocery wanted their Web site to have a high degree of usability in order to be competitive with other online stores. They used consistent design and consistent navigation options so that their customers could learn and remember their way around the Web site. They also used the clearest and simplest language appropriate for the site's content so that their customers could quickly understand the material.
While these features made the site more usable for all of the online-grocery's customers, they made it possible for Mr. Sands to use the site. Mr. Sands now shops on the online grocery site a few times a month, and just buys a few fresh items each day at the supermarket where he works.
Ms. Kaseem uses the Web to find new restaurants to go to with friends and classmates. She has low vision and is deaf. She uses a screen magnifier to enlarge the text on Web sites to a font size that she can read. When screen magnification is not sufficient, she also uses a screen reader to drive a refreshable braille display, which she reads slowly.
At home, Ms. Kaseem browses local Web sites for new and different restaurants. She uses a personal style sheet with her browser, which makes all Web pages display according to her preferences. Her preferences include having background patterns turned off so that there is enough contrast for her when she uses screen magnification. This is especially helpful when she reads on-line sample menus of appealing restaurants.
A multimedia virtual tour of local entertainment options was recently added to the Web site of the city in which Ms. Kaseem lives. The tour is captioned and described -- including text subtitles for the audio, and descriptions of the video -- which allows her to access it using a combination of screen magnification and braille. The interface used for the virtual tour is accessible no matter what kind of assistive technology she is using -- screen magnification, her screen reader with refreshable braille, or her portable braille device. Ms. Kaseem forwards the Web site address to friends and asks if they are interested in going with her to some of the restaurants featured on the tour.
She also checks the public transportation sites to find local train or bus stops near the restaurants. The Web site for the bus schedule has frames without meaningful titles, and tables without clear column or row headers, so she often gets lost on the site when trying to find the information she needs. The Web site for the local train schedule, however, is easy to use because the frames on that Web site have meaningful titles, and the schedules, which are laid out as long tables with clear row and column headers that she uses to orient herself even when she has magnified the screen display.
Occasionally she also uses her portable braille device, with an infrared connection, to get additional information and directions at a publicly-available information kiosk in a shopping mall downtown; and a few times she has downloaded sample menus into her braille device so that she has them in an accessible format once she is in the restaurant.
This section describes general kinds of disabilities that can affect access to the Web. There are as yet no universally accepted categorizations of disability, despite efforts towards that goal. Commonly used disability terminology varies from country to country and between different disability communities in the same country. There is a trend in many disability communities to use functional terminology instead of medical classifications. This document does not attempt to comprehensively address issues of terminology.
Abilities can vary from person to person, and over time, for different people with the same type of disability. People can have combinations of different disabilities, and combinations of varying levels of severity.
The term "disability" is used very generally in this document. Some people with conditions described below would not consider themselves to have disabilities. They may, however, have limitations of sensory, physical or cognitive functioning which can affect access to the Web. These may include injury-related and aging-related conditions, and can be temporary or chronic.
The number and severity of limitations tend to increase as people age, and may include changes in vision, hearing, memory, or motor function. Aging-related conditions can be accommodated on the Web by the same accessibility solutions used to accommodate people with disabilities.
Sometimes different disabilities require similar accommodations. For instance, someone who is blind and someone who cannot use his or her hands both require full keyboard equivalents for mouse commands in browsers and authoring tools, since they both have difficulty using a mouse but can use assistive technologies to activate commands supported by a standard keyboard interface.
Many accessibility solutions described in this document contribute to "universal design" (also called "design for all") by benefiting non-disabled users as well as people with disabilities. For example, support for speech output not only benefits blind users, but also Web users whose eyes are busy with other tasks; while captions for audio not only benefit deaf users, but also increase the efficiency of indexing and searching for audio content on Web sites.
Each description of a general type of disability includes several brief examples of the kinds of barriers someone with that disability might encounter on the Web. These lists of barriers are illustrative and not intended to be comprehensive. Barrier examples listed here are representative of accessibility issues that are relatively easy to address with existing accessibility solutions, except where otherwise noted.
Blindness involves a substantial, uncorrectable loss of vision in both eyes.
To access the Web, many individuals who are blind rely on screen readers -- software that reads text on the screen (monitor) and outputs this information to a speech synthesizer and/or refreshable braille display. Some people who are blind use text-based browsers such as Lynx, or voice browsers, instead of a graphical user interface browser plus screen reader. They may use rapid navigation strategies such as tabbing through the headings or links on Web pages rather than reading every word on the page in sequence.
Examples of barriers that people with blindness may encounter on the Web can include:
There are many types of low vision (also known as "partially
sighted" in parts of Europe), for instance poor acuity (vision that is
not sharp), tunnel vision (seeing only the middle of the visual field),
central field loss (seeing only the edges of the visual field), and
To use the Web, some people with low vision use extra-large monitors, and increase the size of system fonts and images. Others use screen magnifiers or screen enhancement software. Some individuals use specific combinations of text and background colors, such as a 24-point bright yellow font on a black background, or choose certain typefaces that are especially legible for their particular vision requirements.
Barriers that people with low vision may encounter on the Web can include:
Color blindness is a lack of sensitivity to certain colors. Common
forms of color blindness include difficulty distinguishing between red
and green, or between yellow and blue. Sometimes color blindness
results in the inability to perceive any color.
To use the Web, some people with color blindness use their own style sheets to override the font and background color choices of the author.
Barriers that people with color blindness may encounter on the Web can include:
Deafness involves a substantial uncorrectable impairment of hearing
in both ears. Some deaf individuals' first language is a sign language,
they may or may not read a written language fluently, or speak clearly.
To use the Web, many people who are deaf rely on captions for audio content. They may need to turn on the captions on an audio file as they browse a page; concentrate harder to read what is on a page; or rely on supplemental images to highlight context.
Barriers that people who are deaf may encounter on the Web can include:
A person with a mild to moderate hearing impairment may be
considered hard of hearing.
To use the Web, people who are hard of hearing may rely on captions for audio content and/or amplification of audio. They may need to toggle the captions on an audio file on or off, or adjust the volume of an audio file.
Barriers encountered on the Web can include:
Motor disabilities can include weakness, limitations of muscular
control (such as involuntary movements, lack of coordination, or
paralysis), limitations of sensation, joint problems, or missing limbs.
Some physical disabilities can include pain that impedes movement.
These conditions can affect the hands and arms as well as other parts
of the body.
To use the Web, people with motor disabilities affecting the hands or arms may use a specialized mouse; a keyboard with a layout of keys that matches their range of hand motion; a pointing device such as a head-mouse, head-pointer or mouth-stick; voice-recognition software; an eye-gaze system; or other assistive technologies to access and interact with the information on Web sites. They may activate commands by typing single keystrokes in sequence with a head pointer rather than typing simultaneous keystrokes ("chording") to activate commands. They may need more time when filling out interactive forms on Web sites if they have to concentrate or maneuver carefully to select each keystroke.
Barriers that people with motor disabilities affecting the hands or arms may encounter include:
Speech disabilities can include difficulty producing speech that is
recognizable by some voice recognition software, either in terms of
loudness or clarity.
To use parts of the Web that rely on voice recognition, someone with a speech disability needs to be able to use an alternate input mode such as text entered via a keyboard.
Barriers that people with speech disabilities encounter on the Web can include:
Individuals with dyslexia or dyscalculia (sometimes called
in the U.S.) may have difficulty processing written language or images
read visually, or spoken language when heard, or numbers when read
To use the Web, people with learning disabilities may rely on getting information through several modalities at the same time. For instance, someone who has difficulty reading may use a screen reader plus synthesized speech to facilitate comprehension, while someone with an auditory processing disability may use captions to help understand an audio track.
Barriers that people with learning disabilities may encounter on the Web can include:
Individuals with attention deficit disorder may have difficulty focusing on information.
To use the Web, an individual with an attention deficit disorder may need to turn off animations on a site in order to be able to focus on the site's content.
Barriers that people with attention deficit disorder may encounter on the Web can include:
Individuals with impairments of intelligence (sometimes called
"learning disabilities" in Europe; or "developmental disabilities" or
in the United States) may learn more slowly, or have difficulty
understanding complex concepts. Down Syndrome is one among many
different causes of intellectual
To use the Web, people with intellectual impairments may take more time on a Web site, may rely more on graphics to enhance understanding of a site, and may benefit from the level of language on a site not being unnecessarily complex for the site's intended purpose.
Barriers can include:
Individuals with memory impairments may have problems with
short-term memory, missing long-term memory, or some loss of language.
To use the Web, people with memory impairments may rely on a consistent navigational structure throughout the site.
Barriers can include:
Individuals with mental or emotional disabilities may have
difficulty focusing on information on a Web site, or difficulty with
or hand tremors due to side effects from medications.
To use the Web, people with psychiatric disabilities may need to turn off distracting visual or audio elements, or to use screen magnifiers.
Barriers can include:
Some individuals with seizure disorders, including people with some
types of epilepsy, are triggered by visual
flickering or audio signals at a certain frequency.
To use the Web, people with seizure disorders may need to turn off animations, blinking text, or certain frequencies of audio. Avoidance of these visual or audio frequencies in Web sites prevents inadvertent triggering of seizures.
Barriers can include:
Combinations of disabilities may reduce a user's flexibility in using accessibility information.
For instance, while someone who is blind can benefit from hearing an audio description of a Web-based video, and someone who is deaf can benefit from seeing the captions accompanying audio, someone who is both deaf and blind needs access to a text transcipt of the description of the audio and video, which they could access on a refreshable braille display.
Similarly, someone who is deaf and has low vision might benefit from the captions on audio files, but only if the captions could be enlarged and the color contrast adjusted.
Someone who cannot move his or her hands, and also cannot see the screen well, might use a combination of speech input and speech output, and might therefore need to rely on precise indicators of location and navigation options in a document.
Changes in people's functional ability due to aging can include subtle and/or gradual changes in abilities or a combination of abilities including vision, hearing, dexterity and memory. Barriers can include any of the issues already mentioned above. Any one of these limitations can affect an individual's ability to access Web content. Together, these changes can become more complex to accommodate.
For example, someone with low vision may need screen magnification, however when using screen magnification the user loses surrounding contextual information, which adds to the difficulty which a user with short-term memory loss might experience on a Web site.
Assistive technologies are products used by people with
to help accomplish tasks that they cannot accomplish otherwise or could
do easily otherwise. When used with computers, assistive technologies
are sometimes referred to as adaptive software or hardware.
Some assistive technologies are used together with graphical desktop
voice browsers, multimedia players, or plug-ins. Some accessibility
solutions are built into the operating system, for instance the ability
to change the system font size, or configure the operating system so
that multiple-keystroke commands can be entered with a sequence of
Adaptive strategies are techniques that people with disabilities use
to assist in using computers or other devices. For example someone who
cannot see a Web page may tab through the links on a page as one
strategy for helpinjg skim the content.
Following is a list of the assistive technologies and adaptive
strategies described below. This is by no means a comprehensive list of
all such technologies or strategies, but rather explanations of
examples highlighted in the scenarios above.
Alternate keyboards or switches are hardware or software devices used by people with physical disabilities, that provide an alternate way of creating keystrokes that appear to come from the standard keyboard. Examples include keyboard with extra-small or extra-large key spacing, keyguards that only allow pressing one key at a time, on-screen keyboards, eyegaze keyboards, and sip-and-puff switches. Web-based applications that can be operated entirely from the keyboard, with no mouse required, support a wide range of alternative modes of input.
Braille is a system using six to eight raised dots in various
patterns to represent letters and numbers that can be read by the
fingertips. Braille systems vary greatly around the world. Some
"grades" of braille include additional
codes beyond standard alpha-numeric characters to represent common
groupings (e.g., "th," "ble" in Grade II American English braille) in
to make braille more compact. An 8-dot version of braille has been
to allow all ASCII characters to be represented. Refreshable or dynamic
involves the use of a mechanical display where dots (pins) can be
and lowered dynamically to allow any braille characters to be
Refreshable braille displays can be incorporated into portable braille
with the capabilities of small computers, which can also be used as
to devices such as information kiosks.
Scanning software is adaptive software used by individuals with some physical or cognitive disabilities that highlights or announces selection choices (e.g., menu items, links, phrases) one at a time. A user selects a desired item by hitting a switch when the desired item is highlighted or announced.
Screen magnification is software used primarily by individuals with low vision that magnifies a portion of the screen for easier viewing. At the same time screen magnifiers make presentations larger, they also reduce the area of the document that may be viewed, removing surrounding context . Some screen magnifiers offer two views of the screen: one magnified and one default size for navigation.
Software used by individuals who are blind or who have dyslexia that interprets what is displayed on a screen and directs it either to speech synthesis for audio output, or to refreshable braille for tactile output. Some screen readers use the document tree (i.e., the parsed document code) as their input. Older screen readers make use of the rendered version of a document, so that document order or structure may be lost (e.g., when tables are used for layout) and their output may be confusing.
Speech (or voice) recognition is used by people with some physical disabilities or temporary injuries to hands and forearms as an input method in some voice browsers. Applications that have full keyboard support can be used with speech recognition.
Speech synthesis or speech output can be generated by screen readers or voice browsers, and involves production of digitized speech from text. People who are used to using speech output sometimes listen to it at very rapid speeds.
Some accessibility solutions are adaptive strategies rather than specific assistive technologies such as software or hardware. For instance, for people who cannot use a mouse, one strategy for rapidly scanning through links, headers, list items, or other structural items on a Web page is to use the tab key to go through the items in sequence. People who are using screen readers -- whether because they are blind or dyslexic -- may tab through items on a page, as well as people using voice recognition.
Text browsers such as Lynx are an alternative to graphical user
interface browsers. They can be used with screen readers for people who
are blind. They are also used by many people who have low bandwidth
connections and do
not want to wait for images to download.
Visual notification is an alternative feature of some operating systems that allows deaf or hard of hearing users to receive a visual alert of a warning or error message that might otherwise be issued by sound.
Voice browsers are systems which allow voice-driven navigation, some with both voice-input and voice-output, and some allowing telephone-based Web access.
This section includes a selection of illustrative links for specific accessibility provisions highlighted in the scenarios section above.
Some links lead to checkpoints in the Web Content Accessibility Guidelines 1.0, Authoring Tool Accessibility Guidelines 1.0, or User Agent Accessibility Guidelines 1.0. Other links lead to examples in the Curriculum for Web Content Accessibility Guidelines 1.0.
This section is not a comprehensive listing of accessibility
provisions in the three sets of guidelines.
The World Wide Web is full of information about disabilities. The key can be locating information that is relevant to the issue of accessibility to the Web, and is accurate and up-to-date. It can be important to note the perspective from which the information is written. For example, there is much information about different diseases on the Web, but medical details can be less relevant to understanding how people with disabilities use the Web than the perspectives of people with disabilities themselves; information about assistive technologies used with the Web; and information from organizations that focus on accessibility strategies for using information technologies and telecommunications. One way to start is by doing Web searches on the terms used in this document.
W3C's Web Accessibility Initiative (WAI) addresses accessibility of the Web through five complementary activities that:
WAI's International Program Office enables partnering of industry, disability organizations, accessibility research organizations, and governments interested in creating an accessible Web. WAI sponsors include the US Department of Education's National Institute on Disability and Rehabilitation Research; the European Commission's Information Society Technologies Programme; Government of Canada, Industry Canada; Fundacion ONCE, HP, IBM, Microsoft Corporation, SAP, Verizon Foundation, and Wells Fargo. Additional information on WAI is available at http://www.w3.org/WAI/.
The W3C was created to lead the Web to its full potential by developing common protocols that promote its evolution and ensure its interoperability. It is an international industry consortium jointly run by the Computer Science and Artificial Intelligence Laboratory (CSAIL) at Massachusetts Institute of Technology (MIT) in the USA, the National Institute for Research in Computer Science and Control (INRIA) in France and Keio University in Japan. Services provided by the Consortium include: a repository of information about the World Wide Web for developers and users; reference code implementations to embody and promote standards; and various prototype and sample applications to demonstrate use of new technology. For more information about W3C, see http://www.w3.org/.
We would like to thank the following people who have contributed substantially to this document:
Some initial material drawn from Gregg Vanderheiden and Kate Vanderheiden. Additional contributions from Kathleen Anderson, Andrew Arch, Harvey Bingham, Helle BjarnÝ, Alan Cantor, Alan Chuter, Dave Clark, Libby Cohen, Cynthia Curry, Deborah Dimmick, Sylvie Duchateau, Julie Howell, Ian Jacobs, Marja-Riitta Koivunen, Chuck Letourneau, William Loughborough, Charles McCathieNevile, Sailesh Panchang, Doyle Saylor, Sheela Sethuraman, Henk Snetselaar, Jeff Turner, Carlos Velasco, Eric Velleman, and participants of the Education and Outreach Working Group.