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ARIA role dialog and use of aria-hidden

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From: Rolf Mager
Date: Aug 10, 2016 3:42AM

Hello all,

I was trying to find hard evidence that developers should make use of attribute aria-hidden to hide the page background when displaying a modal dialog box with the ARIA role "dialog". So far, I have not found any "official" advise. The Authoring Practices Guide (APG) does not mention the use of aria-hidden:

http://www.w3.org/TR/wai-aria-practices/#dialog_modal

And also the wiki pages of the WCAG Working Group give advise to use aria-hidden for mobile devices only:

https://www.w3.org/WAI/GL/wiki/Using_ARIA_role%3Ddialog_to_implement_a_modal_dialog_box#Description

Shouldn't this recommendation apply in general, not only for mobile devices, was this just an oversight by the wiki authors?

Thanks in advance, best wishes,
Rolf