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WAI-ARIA
Web Accessibility Initiative
Accessible Rich Internet Applications
O que é?
– Define um método para criar conteúdo e
aplicações web mais acessíveis para
pessoas com necessidades especiais.
Regra #1
• Quando a semântica já está presente,
não utilizar.
Regra #2
• Sempre priorize a semântica.
Regra #3
• Todos os controles interativos que usam
os atributos ARIA devem ser acessíveis
através do teclado.
Regra #4
• Nunca use aria-hidden=true e
role=presentation em elementos que
podem receber foco.
Regra #5
• Elementos de interação devem ter nomes
acessíveis.
Roles: role=“x”
• alert
• alertdialog
• application
• banner
• dialog
• slider
• progressbar
• heading
• navigation
• search
• tree
States: aria-x=“true|false”
• busy
• checked
• disabled
• hidden
• invalid
• selected
Properties: aria-x=“true|false”
• describedby
• label
• required
• multiline
• valuemax
• valuemin
• autocomplete
tabindex
• > 0 = Respeita ordem declarada
• 0 = Respeita ordem do DOM
• -1 = Remove da navegação via TAB
Exemplo
<li role=“presentation”>
<a href=“#panel1” role=“tab” aria-selected=“true”
aria-controls=“panel1”>Tab 1</a>
</li>
<li role=“presentation”>
<a href=“#panel2” role=“tab” aria-selected=“true”
aria-controls=“panel2”>Tab 1</a>
</li>
Exemplo
<div id="panel1" role="tabpanel" aria-labelledby="tab1">
...
</div>
<div id="panel2" role="tabpanel" aria-labelledby="tab2">
...
</div>
Boas práticas
– Estrutura semântica
– Manter hierarquia do DOM ao remover
estilos
– Permitir navegação amigável através de
tabindex
– Texto alternativo para imagens – descrever a
imagem
– Saber utilizar o atributo accessKey
– Seguir convenções de conteúdo (WCAG)
Accessibility Developer Tools
Referências
– W3C Accessibility -
http://www.w3.org/standards/webdesign/accessi
bility
– WCAG - http://www.w3.org/TR/WCAG20/
– Making Accessible Web Components -
https://www.polymer-
project.org/articles/accessible-web-
components.html
– Using WAI-ARIA in HTML -
http://rawgit.com/w3c/aria-in-

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WAI-ARIA