Web accessibility refers to the practice of making websites A website is a collection of related web pages, images, videos or other digital assets that are addressed with a common domain name or IP address in an Internet Protocol-based network. A web site is hosted on at least one web server, accessible via the Internet or a private local area network usable by people of all abilities and disabilities Disability is defined by the Americans with Disabilities Act of 1990 as "a physical or mental impairment that substantially limits one or more major life activities." An individual may also qualify as disabled if he/she has had an impairment in the past or is seen as disabled based on a personal or group standard or norm. Such. When sites are correctly designed, developed and edited, all users can have equal access to information and functionality. For example, when a site is coded with semantically meaningful HTML HTML, an initialism for Hypertext Mark-up Language, is the predominant markup language for web pages. It provides a means to describe the structure of text-based information in a document—by denoting certain text as links, headings, paragraphs, lists, etc.—and to supplement that text with interactive forms, embedded images, and other objects, with textual equivalents provided for images and with links named meaningfully, this helps blind users using text-to-speech software and/or text-to-Braille hardware. When text and images are large and/or enlargable, it is easier for users with poor sight to read and understand the content. When links are underlined (or otherwise differentiated) as well as coloured, this ensures that color blind Color blindness, or Colour blindness, a color vision deficiency, is the inability to perceive differences between some of the colors that others can distinguish. It is most often of genetic nature, but may also occur because of eye, nerve, or brain damage, or due to exposure to certain chemicals. The English chemist John Dalton published the first users will be able to notice them. When clickable links and areas are large, this helps users who cannot control a mouse In computing, a mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. Physically, a mouse consists of an object held under one of the user's hands, with one or more buttons. It sometimes features other elements, such as "wheels", which allow the user to perform various system- with precision. When pages are coded so that users can navigate by means of the keyboard In computing, a keyboard is an input device, partially modeled after the typewriter keyboard, which uses an arrangement of buttons or keys, which act as mechanical levers or electronic switches. A keyboard typically has characters engraved or printed on the keys and each press of a key typically corresponds to a single written symbol. However, to alone, or a single switch access device alone, this helps users who cannot use a mouse or even a standard keyboard. When videos are closed captioned or a sign language A sign language is a language which, instead of acoustically conveyed sound patterns, uses visually transmitted sign patterns (manual communication, body language and lip patterns) to convey meaning—simultaneously combining hand shapes, orientation and movement of the hands, arms or body, and facial expressions to express fluidly a speaker's version is available, deaf and hard of hearing users can understand the video. When flashing effects are avoided or made optional, users prone to seizures An epileptic seizure is a transient symptom of excessive or synchronous neuronal activity in the brain. It can manifest as an alteration in mental state, tonic or clonic movements, convulsions, and various other psychic symptoms . The medical syndrome of recurrent, unprovoked seizures is termed epilepsy, but seizures can occur in people who do not caused by these effects are not put at risk. And when content is written in plain language and illustrated with instructional diagrams and animations, users with dyslexia Dyslexia is a learning disability that makes itself manifest primarily as a difficulty with the visual notation of speech or written language, particularly with reading the various man-made writing systems. It is separate and distinct from reading difficulties resulting from other causes, such as a non-neurological deficiency with vision or and learning difficulties are better able to understand the content. When sites are correctly built and maintained, all of these users can be accommodated while not impacting on the usability of the site for non-disabled users.

The needs that Web accessibility aims to address include:

• Visual: Visual impairments In the U.S., the terms partially sighted, low vision, legally blind, and totally blind are used in the educational context to describe students with visual impairments. They are defined as follows: including blindness Blindness is the condition of lacking visual perception due to physiological or neurological factors, various common types of low vision Low vision is a subspecialty within the professions of optometry and ophthalmology and opticianry dealing with individuals who have less than normal vision even with the most accurate conventional prescription available. It can be a result of either congenital or acquired factors. An example of the former is Leber's congenital amaurosis and of the and poor eyesight, various types of color blindness Color blindness, or Colour blindness, a color vision deficiency, is the inability to perceive differences between some of the colors that others can distinguish. It is most often of genetic nature, but may also occur because of eye, nerve, or brain damage, or due to exposure to certain chemicals. The English chemist John Dalton published the first;
• Motor/Mobility: e.g. difficulty or inability to use the hands, including tremors, muscle slowness, loss of fine muscle control, etc., due to conditions such as Parkinson's Disease Parkinson's disease is a chronic and progressive degenerative disease of the brain that impairs motor control, speech, and other functions. The disease is named after English physician James Parkinson, who gave a detailed description of it in an 1817 work titled, "An Essay on the Shaking Palsy", muscular dystrophy Muscular dystrophy refers to a group of genetic, hereditary muscle diseases that weaken the muscles that move the human body. Muscular dystrophies are characterized by progressive skeletal muscle weakness, defects in muscle proteins, and the death of muscle cells and tissue. Nine diseases including Duchenne, Becker, limb girdle, congenital,, cerebral palsy Cerebral refers to the cerebrum, which is the affected area of the brain , and palsy refers to disorder of movement. CP is caused by damage to the motor control centers of the developing brain and can occur during pregnancy (about 75 percent), during childbirth (about 5 percent) or after birth (about 15 percent) up to about age three. Further, stroke A stroke is the rapidly developing loss of brain function due to disturbance in the blood supply to the brain. This can be due to ischemia (lack of blood supply) caused by thrombosis or embolism or due to a hemorrhage. As a result, the affected area of the brain is unable to function, leading to inability to move one or more limbs on one side of;
• Auditory: Deafness A hearing impairment or deafness is a full or partial decrease in the ability to detect or understand sounds. Caused by a wide range of biological and environmental factors, loss of hearing can happen to any organism that perceives sound. "Hearing impaired" is often used to refer to those who are deaf, although the term is no longer or hearing impairments A hearing impairment or deafness is a full or partial decrease in the ability to detect or understand sounds. Caused by a wide range of biological and environmental factors, loss of hearing can happen to any organism that perceives sound. "Hearing impaired" is often used to refer to those who are deaf, although the term is no longer, including individuals who are hard of hearing A hearing impairment is a full or partial decrease in the ability to detect or understand sounds. Caused by a wide range of biological and environmental factors, loss of hearing can happen to any organism that perceives sound. "Hearing impaired" is often used to refer to those who are deaf, although the term is no longer politically;
• Seizures: Photoepileptic seizures An epileptic seizure is a transient symptom of excessive or synchronous neuronal activity in the brain. It can manifest as an alteration in mental state, tonic or clonic movements, convulsions, and various other psychic symptoms . The medical syndrome of recurrent, unprovoked seizures is termed epilepsy, but seizures can occur in people who do not caused by visual strobe or flashing effects.
• Cognitive/Intellectual: Developmental disabilities The term first appeared in U.S. law in 1970, when Congress used the term to describe the population of individuals who had historically been placed in state institutions, in its effort to improve conditions in these dehumanizing facilities . The law has since been amended many times, and now calls for the full community inclusion and self-, learning disabilities In the United States and Canada, the terms learning disability and learning disorder refer to a group of disorders that affect a broad range of academic and functional skills including the ability to speak, listen, read, write, spell, reason, organize information, and do math. The disorders are neurological in origin and reflect information (dyslexia Dyslexia is a learning disability that makes itself manifest primarily as a difficulty with the visual notation of speech or written language, particularly with reading the various man-made writing systems. It is separate and distinct from reading difficulties resulting from other causes, such as a non-neurological deficiency with vision or, dyscalculia Dyscalculia or math disability is a specific learning disability involving innate difficulty in learning or comprehending mathematics, etc.), and cognitive disabilities of various origins, affecting memory, attention, developmental "maturity," problem-solving and logic skills, etc.;

Assistive technologies used for web browsing

Individuals living with a disability use assistive technologies Assistive technology is a generic term that includes assistive, adaptive, and rehabilitative devices for people with disabilities and includes the process used in selecting, locating, and using them such as the following to enable and assist web browsing:

• Screen reader A screen reader is a software application that attempts to identify and interpret what is being displayed on the screen . This interpretation is then re-presented to the user with text-to-speech, sound icons, or a Braille output device. Screen readers are a form of assistive technology (AT) potentially useful to people who are blind, visually software, which can read out, using synthesized speech, either selected elements of what is being displayed on the monitor (helpful for users with reading or learning difficulties), or which can read out everything that is happening on the computer (used by blind and vision impaired users).
• Braille terminals, consisting of a Refreshable Braille display which renders text as Braille The Braille system is a method that is widely used by blind people to read and write. Braille was devised in 1821 by Louis Braille, a Frenchman. Each Braille character or cell is made up of six dot positions, arranged in a rectangle containing two columns of three dots each. A dot may be raised at any of the six positions to form sixty-four characters (usually by means of raising pegs through holes in a flat surface) and either a QWERTY QWERTY is the most used modern-day keyboard layout on English-language computer and typewriter keyboards. It takes its name from the first six characters seen in the far left of the keyboard's top row of letters. The QWERTY design was patented by Christopher Sholes in 1874 and sold to Remington in the same year, when it first appeared in or Braille keyboard.
• Screen magnification A screen magnifier is software that interfaces with a computer's graphical output to present enlarged screen content. It is a type of assistive technology suitable for visually impaired people with some functional vision; visually impaired people with little or no functional vision usually use a screen reader software, which enlarges what is displayed on the computer monitor, making it easier to read for vision impaired users.
• Speech recognition Speech recognition converts spoken words to machine-readable input (for example, to key presses, using the binary code for a string of character codes). The term "voice recognition" is sometimes incorrectly used to refer to speech recognition, when actually referring to speaker recognition, which attempts to identify the person speaking, software that can accept spoken commands to the computer, or turn dictation into grammatically correct text - useful for those who have difficulty using a mouse or a keyboard.
• Keyboard overlays, which can make typing easier and more accurate for those who have motor control difficulties.

Guidelines on accessible web design

Web Content Accessibility Guidelines

In 1999 the Web Accessibility Initiative The World Wide Web Consortium 's Web Accessibility Initiative (WAI) is an effort to improve the accessibility of the World Wide Web (WWW or Web) for people with disabilities. People with disabilities may encounter difficulties when using computers generally, but also on the Web. Since people with disabilities often require non-standard devices and, a project by the World Wide Web Consortium The World Wide Web Consortium is the main international standards organization for the World Wide Web (abbreviated WWW or W3). It is arranged as a consortium where member organizations maintain full-time staff for the purpose of working together in the development of standards for the World Wide Web. As of June 2009, the W3C had 388 members (W3C), published the Web Content Accessibility Guidelines Web Content Accessibility Guidelines are part of a series of Web accessibility guidelines published by the W3C's Web Accessibility Initiative. They consist of a set of guidelines on making content accessible, primarily for disabled users, but also for all user agents, including highly limited devices, such as mobile phones. The current version is 2 WCAG 1.0 Web Content Accessibility Guidelines are part of a series of Web accessibility guidelines published by the W3C's Web Accessibility Initiative. They consist of a set of guidelines on making content accessible, primarily for disabled users, but also for all user agents, including highly limited devices, such as mobile phones. The current version is 2. In recent years, these have been widely accepted as the definitive guidelines on how to create accessible websites.

On 11 December 2008, the WAI released the WCAG 2.0 Web Content Accessibility Guidelines are part of a series of Web accessibility guidelines published by the W3C's Web Accessibility Initiative. They consist of a set of guidelines on making content accessible, primarily for disabled users, but also for all user agents, including highly limited devices, such as mobile phones. The current version is 2 as a Recommendation. WCAG 2.0 aims to be up to date and more technology neutral.

Criticism of WAI guidelines

For a general criticism of the W3C process, read Putting the user at the heart of the W3C process. In articles such as WCAG 2.0: The new W3C guidelines evaluated, To Hell with WCAG 2.0 and Testability Costs Too Much, the WAI has been criticised for allowing WCAG 1.0 to get increasingly out of step with today's technologies and techniques for creating and consuming web content, for the slow pace of development of WCAG 2.0, for making the new guidelines difficult to navigate and understand, and other argued failings. In one attempt to provide guidelines that are designed to be up to date, easier to understand, and more relevant and practical to typical web development projects, Joe Clark's WCAG Samurai project has published an unofficial set of errata to WCAG 1.0.

Other guidelines

Canada

Canada has the Common Look and Feel Standards requiring federal government internet websites to meet Web Content Accessibility Guidelines Web Content Accessibility Guidelines are part of a series of Web accessibility guidelines published by the W3C's Web Accessibility Initiative. They consist of a set of guidelines on making content accessible, primarily for disabled users, but also for all user agents, including highly limited devices, such as mobile phones. The current version is 2 (WCAG) 1.0 Checkpoints Priorities 1 and 2 (Double A conformance level). The standards have existed since 2000 and were updated in 2007.

Philippines

As part of the Web Accessibility Initiatives in the Philippines, the government through the National Council for the Welfare of Disabled Persons (NCWDP) board approved the recommendation of forming an adhoc or core group of webmasters that will help in the implementation of the Biwako Millennium Framework set by the UNESCAP.

The Philippines The Philippines, officially known as the Republic of the Philippines, is a country in Southeast Asia with Manila as its capital city. It comprises 7,107 islands in the western Pacific Ocean was also the place where the Interregional Seminar and Regional Demonstration Workshop on Accessible Information and Communications Technologies (ICT) to Persons with Disabilities was held where eleven countries from Asia - Pacific were represented. The Manila Accessible Information and Communications Technologies Design Recommendations was drafted and adopted in 2003.

Spain

In Spain, UNE 139803 is the norm entrusted to regulate web accessibility. This standard is based on Web Content Accessibility Guidelines 1.0.^[1]

Sweden

In Sweden, Verva, the Swedish Administrative Development Agency is responsible for a set of guidelines for Swedish public sector web sites. Through the guidelines, Web accessibility is presented as an integral part of the overall development process and not as a separate issue.

The Swedish guidelines contain criteria which cover the entire lifecycle of a website; from its conception to the publication of live web content. These criteria address several areas which should be considered, including:

• accessibility
• usability
• web standards
• privacy issues
• information architecture
• developing content for the web
• Content Management Systems (CMS) / authoring tools selection.
• development of web content for mobile devices.

An English translation was released in April 2008: Swedish National Guidelines for Public Sector Websites

The translation is based on the latest version of Guidelines which was released in 2006.^[2]

United Kingdom

In the UK, the Disability Rights Commission (DRC) in collaboration with BSI British Standards are produced by BSI Group which is incorporated under a Royal Charter and is formally designated as the National Standards Body for the UK. Products and services which BSI certifies as having met the requirements of specific standards within designated schemes are awarded the Kitemark have published Pas 78 which outlines good practice in commissioning accessible websites.

Essential Components of Web Accessibility

In order for the web to be accessible, 7 components must be included^[3]:

1. the content on Web pages must be natural information (text, images, and sound),
2. Web browsers and media players,
3. assistive technologies,
4. users' knowledge and experience using the Web,
5. developers,
6. authoring tools
7. evaluation tools

These components interact with each other to create an environment that is accessible to people with disabilities.

Web developers usually use authoring tools and evaluation tools to create Web content. People ("users") use Web browsers, media players, assistive technologies or other "user agents" to get and interact with the content."^[3]

Guidelines for Different Components

Authoring Tool Accessibility Guidelines (ATAG)^[4]

• contains 28 checkpoints that provide guidance on:
  • producing accessible output that meets standards and guidelines
  • promoting the content author for accessibility-related information
  • providing ways of checking and correcting inaccessible content
  • integrating accessibility in the overall look and feel
  • making the authoring tool itself accessible to people with disabilities

Web Content Accessibility Guidelines (WCAG)^[5]

• 14 guidelines that are general principles of accessible design

User Agent Accessibility Guidelines (UAAG)^[6]

• contains a comprehensive set of checkpoints that cover:
  • access to all content
  • user control over how content is rendered
  • user control over the user interface
  • standard programming interfaces

Legally-required web accessibility

A growing number of countries around the world have introduced legislation which either directly addresses the need for websites and other forms of communication to be accessible to people with disabilities, or which addresses the more general requirement for people with disabilities not to be discriminated against.^{[citation needed]}

Australia

In 2000, an Australian Australia , officially the Commonwealth of Australia, is a country in the southern hemisphere comprising the mainland, which is both the world's smallest continent and the world's largest island, the island of Tasmania, and numerous other islands in the Indian and Pacific Oceans.N4 It is the only area of land simultaneously considered a continent, blind man won a court case against the Sydney Organising Committee of the Olympic Games (SOCOG). This was the first successful case under Disability Discrimination Act 1992 The Disability Discrimination Act 1992 was an act passed by the Parliament of Australia in 1992 to promote the rights of people with disabilities in certain areas such as housing, education and provision of goods and services. It shares a common philosophy with other disability discrimination acts around the world that have emerged in the late 20 because SOCOG had failed to make their official website, Sydney Olympic Games, adequately accessible to blind users. The Human Rights and Equal Opportunity Commission (HREOC) also published World Wide Web Access: Disability Discrimination Act Advisory Notes. All Governments in Australia also have policies and guidelines that require accessible public websites; Vision Australia maintain a complete list of Australian web accessibility policies.^[7]

Ireland

In Ireland Ireland (pronounced /ˈaɪrlənd/ , locally [ˈaɾlənd]; Irish: Éire, pronounced [ˈeːɾʲə] ( listen); Ulster Scots: Airlann, Latin: Hibernia) is the third-largest island in Europe, and the twentieth-largest island in the world. It lies to the north-west of continental Europe and is surrounded by hundreds of islands and islets. To the east of, the Disability Act 2005 was supplemented with the National Disability Authority's Code of Practice on Accessible Public Services in July 2006. It is a practical guide to help all Government Departments and nearly 500 public bodies to comply with their obligations under the Disability Act 2005.

United Kingdom

In the UK The United Kingdom of Great Britain and Northern Ireland is a sovereign state located off the northwestern coast of continental Europe. It is an island country, spanning an archipelago including Great Britain, the northeastern part of Ireland, and many small islands. Northern Ireland is the only part of the UK with a land border, sharing it with, the Disability Discrimination Act 1995 The Disability Discrimination Act 1995 (DDA 1995) is an Act of the Parliament of the United Kingdom which makes it unlawful to discriminate against people in respect of their disabilities in relation to employment, the provision of goods and services, education and transport. It is a civil rights law. Other countries use constitutional, social (DDA) does not refer explicitly to website accessibility, but makes it illegal to discriminate against people with disabilities. The DDA applies to anyone providing a service; public, private and voluntary sectors. The Code of Practice: Rights of Access - Goods, Facilities, Services and Premises document^[8] published by the government's Disability Rights Commission to accompany the Act does refer explicitly to websites as one of the "services to the public" which should be considered covered by the Act.

Website accessibility audits

A growing number of organizations, companies and consultants offer website accessibility audits. These audits, a type of system testing, identify accessibility problems that exist within a website, and provide advice and guidance on the steps that need to be taken to correct these problems.

A range of methods are used to audit websites for accessibility:

• Automated tools are available which can identify some of the problems that are present.
• Expert technical reviewers, knowledgeable in web design technologies and accessibility, can review a representative selection of pages and provide detailed feedback and advice based on their findings.
• User testing, usually overseen by technical experts, involves setting tasks for ordinary users to carry out on the website, and reviewing the problems these users encounter as they try to carry out the tasks.

Each of these methods has its strengths and weaknesses:

• Automated tools can process many pages in a relatively short length of time, but can only identify some of the accessibility problems that might be present in the website.
• Technical expert review will identify many of the problems that exist, but the process is time consuming, and many websites are too large to make it possible for a person to review every page.
• User testing combines elements of usability and accessibility testing, and is valuable for identifying problems that might otherwise be overlooked, but needs to be used knowledgeably to avoid the risk of basing design decisions on one user's preferences.

Ideally, a combination of methods should be used to assess the accessibility of a website.

See also

• Computer accessibility In human-computer interaction, computer accessibility refers to the accessibility of a computer system to all people, regardless of disability or severity of impairment. It is largely a software concern; when software, hardware, or a combination of hardware and software, is used to enable use of a computer by a person with a disability or
• Device Independence Device independence is the process of making the web accessible by any device under any circumstance and by all people. The World Wide Web Consortium has initiated the Device Independence Working Group, which aims to unify the web, making it accessible from many types of Internet appliances. Its mission is to avoid the breaking up of the web into
• European Internet Accessibility Observatory
• Maguire v SOCOG 2000
• Multimodal interaction Two major groups of multimodal interfaces have merged. The first group of interfaces combined various user input modes beyond the traditional keyboard and mouse input/output, such as speech, pen, touch, manual gestures, gaze and head and body movements.The most common such interface combines a visual modality with a voice modality (speech
• Progressive enhancement Progressive enhancement is a strategy for web design that emphasizes accessibility, semantic markup, and external stylesheet and scripting technologies. Progressive enhancement uses web technologies in a layered fashion that allows everyone to access the basic content and functionality of a web page, using any browser or Internet connection, while
• Universal design Universal design is a relatively new paradigm that emerged from "barrier-free" or "accessible design" and "assistive technology." Universal design strives to be a broad-spectrum solution that produces buildings, products and environments that are usable and effective for everyone, not just people with disabilities
• Unobtrusive JavaScript
• Web Interoperability

References

1. ^ Asociación Española de Normalización y Certificación (AENOR): UNE 139803:2004, “Aplicaciones informáticas para personas con discapacidad. Requisitos de accesibilidad para contenidos en la Web”, a través del Centro de Referencia en Accesibilidad y Estándares Web (PDF). (The standard can be downloaded at the INTECO website, but INTECO does not own the standard). Accessed 2009-04-30.
2. ^ "New Version of Guidelines for Swedish Public Sector Web Sites". Peter Krantz. http://www.standards-schmandards.com/2006/swe-guidelines/.
3. ^ ^{a b} World Wide Web Consortium: Web Accessibility Initiatitive: Essential Components of Web Accessibility.
4. ^ http://www.w3.org/WAI/intro/atag.php
5. ^ http://www.w3.org/WAI/intro/wcag.php
6. ^ http://www.w3.org/WAI/intro/uaag.php
7. ^ Australian Web Accessibility Policies and Guidelines - AIS Resources - Accessible Information Solutions - Services - Vision Australia
8. ^ Equality and Human Rights Commission - Websites DDA Guidance

• Clark, Joe (2003). Building Accessible Websites. New Riders Press. ISBN 0-7357-1150-X. http://www.joeclark.org/book/.
• Thatcher, Jim; Cynthia Waddell, Shawn Henry, Sarah Swierenga, Mark Urban, Michael Burks, Paul Bohman (2003). Constructing Accessible Web Sites (Reprint ed.). Apress (Previously by Glasshaus). ISBN 1-59059-148-8.
• Slatin, John; Sharron Rush (2002). Maximum Accessibility: Making Your Web Site More Usable for Everyone. Addison-Wesley Professional. ISBN 0-201-77422-4.
• Paciello, Michael (2000). Web Accessibility for People with Disabilities. CMP Books. ISBN 1-929629-08-7. http://www.paciellogroup.com/resources/books.htm.
• Bangeman, Eric (2006-09-10). "Judge: ADA lawsuit against Target can proceed". Ars Technica. http://arstechnica.com/news.ars/post/20060910-7705.html. Retrieved on 2006-09-26.

External links

Standards and guidelines

• The main page for the W3C's Web Accessibility Initiative (WAI)
  • The W3C's WAI Web Content Accessibility Guidelines 1.0, but read the WCAG Overview first
• Wikipedia accessibility guidelines
• University of Illinois iCITA HTML Accessibility Best Practices
• New York State Mandatory Technology Standards for Accessibility of State Agency Web-Based Intranet and Internet Information and Applications–Fourteen standards derived from both U.S. Section 508 and the WAI's WCAG 1.0 and required for NYS agency web sites.
• Americans with Disabilities Act Section 508 Guidelines and Section 508 Homepage
• Unified Web Evaluation Methodology 1.2
• Equality and Human Rights Commission: PAS 78: a guide to good practice in commissioning accessible websites

Government regulations

• Searchable index of government web guidelines
• Americans with Disabilities Act of 1990 (ADA)
• Disability Discrimination Act UK
• Section 508 - requires U.S. government web sites to be accessible
• New York State Technology Policy P04-002–Requires Accessibility of State Agency Web-Based Intranet and Internet Information and Applications, requires all State entity web sites to be accessible according to NYS standards which are a hybrid of Section 508 and the W3C's WCAG 1.0. Updates Statewide Technology Policy 99-3, which required sites to conform to the W3C WCAG 1.0, Priority one checkpoints only.
• Disability Act 2005 Ireland
• Common Look and Feel Standards 2.0 Canada

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