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Accessibility Through Progressive Enhancement
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Mat Marquis
October 13, 2011
Technology
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Accessibility Through Progressive Enhancement
Mat Marquis
October 13, 2011
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Transcript
Accessibility 11 Wednesday, October 12
A ccessibilit y 11 Wednesday, October 12
Why build accessible websites? • Because we’re decent human beings.
• Why wouldn’t we? • What are you, some kind of jerk? • C’mon, man. • C’mon. Wednesday, October 12
Why build accessible websites? • Because we’re decent human beings.
• Why wouldn’t we? • What are you, some kind of jerk? • C’mon, man. • C’mon. Wednesday, October 12
The power of the Web is in its universality. Access
by everyone regardless of disability is an essential aspect. Tim Berners-Lee “ Wednesday, October 12
Difficulty Seeing http://www.census.gov Severe Difficulty Seeing http://www.census.gov Internet Explorer 6
http://www.ie6countdown.com 1.4% 3.4% 0.8% Percentage of U.S. Population Suffering From: Wednesday, October 12
Difficulty Seeing http://www.census.gov Severe Difficulty Seeing http://www.census.gov Internet Explorer 6
http://www.ie6countdown.com 1.4% 3.4% 0.8% Percentage of U.S. Population Suffering From: Wednesday, October 12
Who is this for? Wednesday, October 12
Wednesday, October 12
Wednesday, October 12
Wednesday, October 12
Wednesday, October 12
Around 10 percent of the world’s population, or 650 million
people, live with a disability. They are the world's largest minority. The United Nations http://www.un.org/disabilities/default.asp?id=18 “ Wednesday, October 12
Context Wednesday, October 12
Context Wednesday, October 12
Progressive Enhancement Content First HTML CSS WAI-ARIA JavaScript Wednesday, October
12
Progressive Enhancement Content First HTML CSS WAI-ARIA JavaScript Wednesday, October
12
Progressive Enhancement Content First HTML CSS WAI-ARIA JavaScript Wednesday, October
12
Progressive Enhancement Content First HTML CSS WAI-ARIA JavaScript Wednesday, October
12
Progressive Enhancement Content First HTML CSS WAI-ARIA JavaScript Wednesday, October
12
We need to make smarter content, not smarter containers.* Stephanie
Rieger http://twitter.com/stephanierieger “ * We’re gonna make smarter containers, too. Wednesday, October 12
We need to make smarter content, not smarter containers.* Stephanie
Rieger http://twitter.com/stephanierieger “ * We’re gonna make smarter containers, too. Wednesday, October 12
Semantic Markup Wednesday, October 12
0 100 Wednesday, October 12
0 100 <input type="number" name="widget" min="0" max="100" value="0" /> Wednesday,
October 12
<label for="widget">Freeze-Ray Completion Percentage</label> <input type="number" name="widget" id="widget" min="0" max="100"
value="80" /> Wednesday, October 12
Freeze-Ray Completion Percentage 0 Wednesday, October 12
<div class="slider"> <a href="#" class="slider-handle"></a> </div> Wednesday, October 12
<div class="slider"> <a href="#" class="slider-handle" style="left: 80%;"></a> </div> Wednesday, October
12
Freeze-Ray Completion Percentage 0 Wednesday, October 12
0 Freeze-Ray Completion Percentage 50 Wednesday, October 12
<label for="widget">Freeze-Ray Completion Percentage</label> <input type="number" name="widget" id="widget" min="0" max="100"
value="80" /> <div class="slider"> <a href="#" class="slider-handle"></a> </div> Wednesday, October 12
<label for="widget">Freeze-Ray Completion Percentage</label> <input type="number" name="widget" id="widget" min="0" max="100"
value="80" /> Wednesday, October 12
<div class="percent-slider"> <label for="widget">Freeze-Ray Completion Percentage</label> <input type="number" name="widget" id="widget"
min="0" max="100" value="80" /> </div> Wednesday, October 12
.ui-slider label, .ui-slider input { position: absolute; left: -9999px; }
Wednesday, October 12
<div class="percent-slider"> <label for="widget">Freeze-Ray Completion Percentage</label> <input type="number" name="widget" id="widget"
min="0" max="100" value="80" /> </div> Wednesday, October 12
WAI-ARIA* *Web Accessibility Initiative - Accessible Rich Internet Applications Wednesday,
October 12
WAI-ARIA* *Web Accessibility Initiative - Accessible Rich Internet Applications Wednesday,
October 12
ARIA Attributes landmark "banner" "main" "navigation" role "slider" "tabs" state
"aria-expanded" "aria-checked" Wednesday, October 12
ARIA Attributes landmark "banner" "main" "navigation" role "slider" "tabs" state
"aria-expanded" "aria-checked" Wednesday, October 12
<div class="slider"> <a href="#" class="slider-handle" style="left: 80%;"></a> </div> “Number link.”
Wednesday, October 12
<div role="application" class="percent-slider"> <a href="#" class="slider-handle" style="left: 80%;" role="slider" aria-valuemin="0"
aria-valuemax="100" aria-valuenow="80" aria-valuetext="80%"> </a> </div> “Slider control: eighty percent. Use arrows to move handle.” Wednesday, October 12
<div role="application" class="percent-slider"> <a href="#" class="slider-handle" style="left: 80%;" role="slider" aria-valuemin="0"
aria-valuemax="100" aria-valuenow="80" aria-valuetext="80%"> </a> </div> “Slider control: eighty percent. Use arrows to move handle.” Wednesday, October 12
AWESOME Wednesday, October 12
Resources Designing with Progressive Enhancement Building the Web that Works
for Everyone http://wil.to/a11y/g http://wil.to/a11y/ http://twitter.com/wilto Wednesday, October 12