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COMP 135 Web Site Design Intermediate

COMP 135 Web Site Design Intermediate. Week 7. Accessibility. Definition, policies, standards Continuum of abilities. What is Web Accessibility?. The practice of making web sites usable by people of all abilities and disabilities

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COMP 135 Web Site Design Intermediate

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  1. COMP 135Web Site Design Intermediate Week 7

  2. Accessibility Definition, policies, standards Continuum of abilities

  3. What is Web Accessibility? The practice of making web sites usable by people of all abilities and disabilities Correctly designed web sites provide everyone with equal access to information and functionality It is a human right and a moral obligation

  4. Understanding Accessibility t • Visual Impairment • Ranges from complete blindness, to low vision, to colour blindness • Mobility or Dexterity Impairment • Severe: paraplegia/quadriplegia, cerebral palsy, multiple sclerosis • Difficulty with fine-motor: arthritis, Parkinson’s Disease • Old age • Auditory Impairment • Deaf, hard of hearing • Cognitive Impairment • Severe learning disabilities, low literacy or numeracy skills, dyslexia, cultural or language differences

  5. Visual Impairment People who are blind can use computer but they can’t see the screen People with low vision may only see the screen partially People with colour blindness cannot distinguish some colour combinations because of low contrast

  6. Mobility or Dexterity Impairment Limited arm movement Use of only one hand Difficulty controlling fine movements Difficulty holding a mouse Tremors, shaking hands

  7. Auditory Impairment Sure, a deaf person can watch a video, but how meaningful is it without the audio?

  8. Cognitive Difficulties Memory-related Problem-solving Attention deficits Reading, linguistic and verbal comprehension Math comprehension Visual comprehension

  9. Assistive Technologies • Hardware • Touch screens • Head- and mouth-wands • Switches • Customized keyboards • Large mice • trackballs • Software • Screen readers • High contrast colour schemes • Text and icon magnification

  10. Web Content Accessibility Guidelines (WCAG 2.0) W3C standard, approved December 2008 Provides set of principles and guidelines that you should be familiar with before building a web site Consists of four principles and broken down into 12 guidelines Each guideline has several “success criteria”

  11. Levels of Conformance A – This is the lowest level and means you’ve met the minimum level of accesibility AA AAA

  12. Guiding Principlesand Guidelines • Perceivable • Provide text alternatives for any non-text content • Provide alternatives to time-based media • Create content presentable in different ways without losing structure or information • Make it easier to see and hear content (background/foreground contrast • Operable • Make all content accessible by keyboard • Provide enough time to read content • Do not design content that could cause seizures

  13. Understandable • Make text content readable and understandable • Make web pages that operate predictably • Help users avoid and correct mistakes • Robust • Maximize compatibility with current and future user agents and assistive technologies

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