accessibility issues
DESCRIPTION
TRANSCRIPT
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Accessibility IssuesLiddy Nevile
QuickTime™ and aTIFF (Uncompressed) decompressor
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Overview
• Accessibility definitions• Current work to minimise problems• IMS accessibility activities• Matching content to people’s needs• Implementations• References
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Overview
• Accessibility definitionsNot …• Telecommunications …. Or is it?• Economic equity … or is it?
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Typical problems
• Can’t see screen• Can’t see colours• Can’t read text• Can’t hear• Can’t control cursor• Can’t type
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OS supportAdd this to Favorites folderAdd this to startup itemsApple channel…..
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Browser support (?)
• Lynx• IE• Netscape/Mozilla• iCab• Opera• Amaya• There are about 35 browsers in common
use…• (Note W3C UAAG - includes LMS)
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ATs for people with vision disabilities
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Jason White
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Other assistive technologies
QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
![Page 10: Accessibility Issues](https://reader033.vdocuments.us/reader033/viewer/2022061208/548b4acdb4795984178b5da8/html5/thumbnails/10.jpg)
Other accessibility problems
QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
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Accessibility definitions
• W3C - device independence, separation of content from presentation
• U.S. - s. 508 for Federal Govt. contracts• Australia - common law system with
regulations• UK, European Commission …• IMS/MMI-DC Working definition:
mismatch between user needs and content
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W3C Guidelines
• Accessibility guidelines• Techniques• Checkpoints• Checkpoint techniques• QA and Certification- for authors, authoring tools, user
agents
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Localisation of W3C guidelines
• University, system, organisational guidelines
• Controlling systems and templates• EuroAccessibility efforts• CEN MMI-DC Workshop• IMS Accessibility Guidelines• ( -> maths interest)
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W3C Technologies that work
• Cascading style sheets (CSS1)• eXtensible Markup Language and CSS2• Scalable Vector Graphics (SVG)• Synchronised Multimedia Integration
Language (SMIL) • eXtensible Stylesheet Language (XSLT)• ChemML, MathML, MusicML, ...
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SVG example
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SVG example
• Image is represented as vectors in text• Sub-images can be identified• Metadata can be added• Rights management can be used• Behaviours can be controlled
– Eg an interactive knee dissection linked to external resources
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Technologies that work (contd.)
• XML => MathML, ChemML, etc• MathML as an example
– The equation x2 + 4x + 4 =0
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Separate presentation from content
• Presentational markup to ensure display can be controlled - with style sheets to define the display characteristics
• Content markup to provide machine readable version of content so it could be read into content manipulators
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• <mrow>• <mrow>• <msup> <mi>x</MI> <mn>2</mn> </msup> <mo>+</MO>• <mrow>• <mn>4</mn>• <MO>⁢</MO>• <MI>x</MI>• </mrow>• <MO>+</MO>• <mn>4</mn>• </mrow>• <MO>=</MO>• <mn>0</mn>• </mrow>
MathML is like HTML…
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Screen presentation
• It can be read aloud by screen readers
• It can be used in maths applications
• It can be programmed for interactivity
• It can be programmed for feedback
• But it can’t yet be used in Braille.
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Technologies that work (contd.)
• XML and RDF and EARL ….• XML - human readable, schemas etc …..• RDF - this ‘object’ has property ‘this’• EARL - this ’agent’ said this ‘object’ has this
‘property’ on this ‘date’• Eg “The application ‘Lift’ evaluated this
page as accessible (didn’t fail) on 3/9/2002”.
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Author support
• W3C described what to do, how to do it, when and why,…
• Automatic support is required ->• W3C Authoring Tools Accessibility
Guidelines - note s. 508
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Accessibility tools• Accessible tools• Tools for accessible authoring• Validators ie code validators • Evaluators ie compliance with
guidelines producing metadata (EARL)• Digital repositories for descriptive
metadata• (re-usable metadata??)• On-the-fly repair tools (SWAP, TILE, ..)
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New IMS/DC/…approach
• Think of the user and work towards user needs and preferences
• Provide a good, easy way to record user needs and preferences
• Describe content in terms of needs and preferences
• Avoid all issues to do with disabilities and to do with legal liability
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Accessibility issues
• Direct accessibility• Compatible accessibility• Alternative modality• Equivalent content• User choice
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User profiles
• Control• Display (presentation)• Content• A special element to add to the LIP
because this info is usually managed by a different person from the teacher (and sometimes the student)
• Multiple, cascading profiles
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AccLIP (User profile)
• AccessForAll:http://www.imsproject.org/accessibility/
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Content profiles
• Control• Display (presentation)• Content• A separate element as the information
is usually an EARL statement• Same schema for exact matching and
easy maintenance
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AccMD (Content profile)
• An EARL statement … so a URI:http://www.imsproject.org/accessibility
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Implementation
• The Inclusive Learning Exchange at http://inclusivelearning.ca/
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References
• http://w3.org/• http://w3.org/WAI/• http://www.imsproject.org/accessibility• http://dublincore.org/groups/access/• http://inclusivelearning.ca• http://www.OZeWAI.org/