accessibility of services on the web
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Accessibility of services on the web. Table of contents. Statistics Definitions Different kinds of disabilities Solutions for accessibility. Statistics. 21.1% of people with vision problems have Internet access 27.2% of people with hearing problems

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table of contents
Table of contents
  • Statistics
  • Definitions
  • Different kinds of disabilities
  • Solutions for accessibility
statistics
Statistics
  • 21.1% of people with vision problems have Internet access
  • 27.2% of people with hearing problems
  • 22.5% of people with difficulty using hands
  • 42.2% of people with a learning disability

=> 56.7% of non-disabled people

have Internet access

Survey realised in the USA in 2001

definition
Definition
  • Disability: ”Disability is a physical or mental impairment which has an effect on the ability to carry out normal day-to-day activities”
  • Accessibility: ”Accessibility functionality makes content resources usable by persons with disabilities”
  • Web accessibility: ”Web accessibility refers to the practice of making websites usable by people of all abilities and disabilities”
different kinds of disabilities
Different kinds of disabilities
  • Visual (blindness, poor eyesight and colour blindness)‏
  • Aural (deafness and impaired hearing)‏
  • Cognitive (dementia and dyslexia)‏
  • Physical or Motor (muscular dystrophy, cerebral palsy)‏
slide6
W3C
  • W3C (World Wide Web Consortium)‏
  • Founded in 1994 by Tim Berners-Lee
  • Objective: development of web standards and guidelines.
  • Examples: CSS, HTML, XHTML, SOAP, XML, XForms
slide7
WAI
  • WAI (Web Accessibility Initiative)‏
  • Has been launched by W3C in 1997
  • Objective: creation of international standards and guidelines in order to improve the accessibility of web for people with disabilities
tools for blind people
Tools for blind people
  • Screenreader
    • Text-to-spreech
    • Braille output device
  • Oralux: Linux distribution
solutions for visual disability
Solutions for visual disability
  • Use CSS
  • Use headings (H1, H2, H3, H4)‏
  • All informational images use ALT text
  • Provide a site map
  • Make sure that the text can be resized
  • Efficient contrast between background and foreground colours
solutions for aural disability
Solutions for aural disability
  • For any audio content

=> Provide subtitles or written transcripts

solutions for cognitive disability
Solutions for cognitive disability
  • Use simple and easy language (non technical)‏
  • Avoid using words in their non-literal sense
  • Avoid using abstractions
  • Use large headings
  • Do not use scrolling text
solutions for physical or motor disability
Solutions for physical or motor disability
  • These users do not use mouse but only keyboard
    • Use vertical navigation links
  • Avoid flickering between 2 and 55 Hz (epileptic users)‏
conclusion interpretation
Conclusion/Interpretation
  • Solutions are generally easy to implement
  • Solutions are generally cheap
  • Solutions are usefull for disabled and also valid users
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