WAI-ARIA - Speaker Deck

WAI-ARIA

by othree

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WAI-ARIA is more than Accessibility othree @ COSCUP 2011

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Who am I Member of Happy Designer MozTW HTML5-IG-ZH Work PhD Candidate on Civil F2E at HTC

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The History

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Web 2.0

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Age of RIA Rich Internet Applications

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Custom Widgets

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AJAX

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Problems • Custom Widgets • No Semantic, Browser/AT didn’t realize • Can’t get focus

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Problem • AJAX • AT didn’t know when the content changes, and where is it.

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WAI-ARIA

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WAI-ARIA • Proposed by Richard Schwerdtfeger from IBM and Becky Gibson from W3C • W3C Candidate Recommendation at 2011/01/18 • You can use it TODAY http://www.alistapart.com/articles/waiaria

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Components of ARIA • role → browser knows meaning • states and properties → browser knows • redeﬁne tabindex → possible to focus • liveregion → notice when content changes

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• role → browser knows meaning • states and properties → browser knows • redeﬁne tabindex → possible to focus • liveregion → notice when content changes Mapping to Problems

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• role → browser knows meaning • states and properties → browser knows • redeﬁne tabindex → possible to focus • liveregion → notice when content changes • role → deﬁne new roles Mapping to Problems

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• role → browser knows meaning • states and properties → browser knows • redeﬁne tabindex → possible to focus • liveregion → notice when content changes • role → deﬁne new roles • states and properties → store states Mapping to Problems

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Role

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Role, role of element • alert • button • checkbox • dialog • link • menuitem • scrollbar • slider • tab • timer • tooltip • ...

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Slider --

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Slider --

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Role, more than widget • Widgets Roles • Document Structure • Landmark

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Document Structure Landmark • article • heading • img • list • note • presentation • banner • complementary • contentinfo • main • navigation • search

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HTML5 Semantic Tag

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banner main complementary ARIA Document Structure navigation

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Difference ARIA ARIA HTML5 HTML5 banner Banner for entire site Head of section main Main content of page An article

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HTML5 + ARIA

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ARIA can help HTML5 document more semantic

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States & Properties

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Store Methods • Use DOM Node property • Use custom class • Use custom attribute • Use Widget controller • Use centralized storage system

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ARIA slider --

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ARIA slider --

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ARIA slider --

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ARIA slider --

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Also for Relationships • label, describe • owns, controlls

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? ?

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label, describe Link to yahoo1 . . .

Yahoo doo2

wohooo

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label, describe Link to yahoo1 . . .

Yahoo doo2

wohooo

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Live Region

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Live Region • Monitor DOM change • How? • aria-live=”polite”

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Polite Level • off • polite • assertive • rude

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Tabindex

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Redeﬁne Tabindex • Available for all visible elements • Three values • > 0 • 0 → • -1 →

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Redeﬁne Tabindex • Available for all visible elements • Three values • > 0 • 0 → • -1 → • 0 → in native order

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Redeﬁne Tabindex • Available for all visible elements • Three values • > 0 • 0 → • -1 → • 0 → in native order • -1 → need .focus()

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←START

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1 2 3 4 5 6 7... Tab Order

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1 2 3 Ideal Tab Order

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→ Move to Other Tab

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← → Move to Other Tab

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0 -1 -1 -1 -1 Tabindex Value

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-1 0 -1 -1 -1 Tabindex Value

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Not automatically

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More than Accessibility

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SEO • Document Structure & Landmark Role • Yahoo! supports • Google use role too

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Standard Way to Store Property & State • Avoid pollute DOM Node & className • Build relationship between nodes