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[Bug 10914] Allow multiple space separated values for the ARIA role attribute

From: <bugzilla@jessica.w3.org>
Date: Fri, 01 Oct 2010 07:56:04 +0000
To: public-html-a11y@w3.org
Message-Id: <E1P1aTM-0000rp-ST@jessica.w3.org>

--- Comment #2 from Henri Sivonen <hsivonen@iki.fi> 2010-10-01 07:56:04 UTC ---
> 1. It would be appropriate for a horizontal main navigation to have
> role="navigation menubar"

This is not compatible with the forward-compatible processing model for role.
At least when I was previously briefed on ARIA extensibility plans, the plan
was that the UA would always honor one role per element and would honor the
first role it recognizes. Thus, using two roles from ARIA 1.0 is bogus.

Once ARIA.next is around, it would make sense to use two tokens the first one
of which is from ARIA.next and the second one is the best approximation from
ARIA 1.0.

Since ARIA.next isn't here yet, the validator supports only one token in the
role attribute.

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