Accessibility of Common Web Applications
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Transcript of Accessibility of Common Web Applications
Accessibility is thinking about all kinds of people
Blind people (0.5%)
Blind people (0.5%)
Visual impairment (4.39%)
Blind people (0.5%)
Visual impairment (4.39%) Color blindness (10%)
All disabled people (15-20%)
Blind people (0.5%)
Visual impairment (4.39%) Color blindness (10%)
How is it to be visually impaired?
Around 10 – 15% of all people
Normal Vision
Age related Macular degeneration
Cataract
Diabetic Retinopathy
Glaucoma
Normal Vision
How do we feel colors?
Normal Vision
AchromatopsiaAround 0.1% of all people
ProtanopiaAround 1% of all people
DeuteranopiaAround 1.3% of all people
TritanopiaAround 0.02% of all people
How is it to have a motor impairment?
Up to 5% of all people
Imagine there is no mouse
• You have at most keyboard to browse a web site.• You cannot reach non-interactive elements.• All clickable elements on the site are in a sequence.• You are dependent on focus representation of the actual element.
What element is focused at the moment?
Browser could help us a little bit.
It was the Desktop category.
Tab through all the links in the left menu
Tab through all the links in the left menu And all the interactive elements in the page body
Tabbing the elements with yellow borders in cycle. No chance to escape.
Don‘t reinvent the wheel…
Section 508, WCAG, Mandate 376
What properties must have web content?
Information and user interface components must be presentable to users in ways they can perceive
Web content must be
perceivable
All non-text content that is presented to the user has a text alternative that serves the equivalent purpose.
Text Alternatives
Perceivable
Could you describe the buttons bellow?
And now?Disabled person doesn‘t have this view!
Create content that can be presented in different ways (for example simpler layout) without losing information or structure.
Adaptable Content
Perceivable
Make it easier for users to see and hear content including separating foreground from background.
Distinguishable
Perceivable
Normal text size
Text size scaled to 200%
What you see when you don‘t have any disability
What you see when you need a little accessibility help
What you see when you have strong accessibility impairment
User interface components and navigation must be operable
Web content must be operable
Make all functionality available from a keyboard.
Keyboard Accessible
Operable
Do you remember keyboard traps? That‘s when you cannot leave a limited area on the page.
Provide users enough time to read and use content.
Enough Time
Operable
For some people are real-time data difficult to read.
Give them a chance to stop updating the content so they have enough time to read all the important values.
Do not design content in a way that is known to cause seizures.
Seizures
Operable
Sometimes it is on purpose, but don‘t do it in someones future work tool.
Provide ways to help users navigate, find content, and determine where they are.
Navigable
Operable
Information and the operation of user interface must be understandable
Web content must be
understandable
Make text content readable.
Readable
Understandable
Make Web pages appear and operate in predictable ways.
Predictable
Understandable
Help users avoid and correct mistakes.
Input Assistance
Understandable
Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies
Web content must be
robust
Try your creations
http://www.elsa.cvut.cz/ http://carolina.mff.cuni.cz/
Think Accessible!
http://www.w3.org/TR/WCAG20/
