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WCAG
Web Programming(IT342)
Assignment 2
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HISTORY
WCAG is a part of web accessibility
guidelines by theW3Cs Web Accessibility
Initiative.
WCAG 1.0 started on 1999.
WCAG sumurai led by Joe clark started
making corrections and build extensions
now called WCAG 2.0 by 2008 WCAG 2.0 is the latest version in use.
http://www.w3.org/WAI/http://www.w3.org/WAI/http://www.w3.org/WAI/http://www.w3.org/WAI/http://www.w3.org/WAI/ -
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Understanding WCAG
Web content = web pages, websites,
web applications, web documents, etc.
And Accessibility means format should
be accessible.
Web Accessibility also is a measure of
how effectively all people, including those
with disabilities, are able to access and useweb.
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WCAG 2.0 Principles
Content must be Perceivable.
Interface components in the content mustbe Operable
Content and controls must beUnderstandable
Content should be Robust enough to workwith current and future user agents
source:
http://www.w3.org/TR/WCGA20/
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Properties of Accessible Sites:
Can be used by people with physicalimpairments.
Can be used by people who aretechnically and educationally backwards.
Easy for novice users to use.
Work with widest range of browsers andcurrent internet conventions.
Should meet all the guidelines of
WCAG 2.0
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Web Accessibility relation with
Business
Better the accessibility better is the
relation with public users.
Reduces the risk of Legal Actions sinceWCAG is a part of W3C standard.
It will increase the website use thus
increasing the revenue. Direct cost savings.
Increase the search engine optimization.
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WCAG 2.0 Guidelines
Text Alternatives:
Provide text alternatives for any non-text
content so that it can be changed intoother forms people need, such as large
print, Braille, speech, symbols or simpler
language.
Time-Based Media:
Provide alternatives for time-based media
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Continued
Adaptable:
Create content that can be presented in
different ways without losing information
or structure.
Distinguishable :
Make it easier for users to see and hear
content including separating foreground
from background.
More on next slide..
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Continued
Keyboard Accessible
Enough time
Seizures Navigable
Readable
Predictable Input Assistance
Compatible
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Success Criteria:
There are total of 61 success criteria.
It is used for specifying websiterequirements and conformance testing.
Few guidelines are as follows:
Info and Relationships.
Meaningful Sequence.
Sensory Characteristics.
Testable and Flexible.
And many more.
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Accessibility Supported Technology:
Web content technology must meet tworequirements to qualify as an accessibilitysupported web content technology.
The way that the web content technology isused must be supported by users assistivetechnology.
The web content technology must have
accessibility-supported user-agents availableto users.
Source: www.w3.org/TR/UNSERSTANDING-WCGA20/conformance.html
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Continued
W3C does not specify how much support
is necessary for the particular use of web
technologies to be considered as
accessibility supported.
However, only accessibility supported
ways of using technologies can be relied
upon to satisfy the WCAG Success
Criteria.
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Levels of Conformance :
Level A: For Level A conformance( the
minimum level of conformance), the web
page should satisfy all the Level A successcriteria.
Level AA: The web page should satisfy
both Level A and AA success criteria.
Level AAA: The web page should satisfy all
the level A, AA, AAA success criteria
defined by the standards.
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Source: http:www.w3.org/WAI/intro/wcag20
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Challenges for WCAG
Flexibility for developers so that they can
test their pages with it.
Listing the web technologies which are
under accessibility standards.
Encouraging government to use the
standards so as to benefit the noviceusers.
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