[Webkit-unassigned] [Bug 38882] New: Implement support for IAccessible2

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon May 10 19:09:18 PDT 2010


https://bugs.webkit.org/show_bug.cgi?id=38882

           Summary: Implement support for IAccessible2
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows 7
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Accessibility
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jamie at nvaccess.org


MSAA alone is insufficient for reliable, fully functional access to web content by assistive technologies such as screen readers. Some major issues that cannot be resolved using MSAA are:
1. The ability to obtain a unique identifier for an object. This is necessary to enable comparison of objects and caching of object information. Among other things, comparison of objects is required to associate events with the correct object if the AT has cached some information about that object. Note that while the IAccessibleComparable interface is currently provided, this requires the AT to hold references to all objects rather than just storing the unique identifiers.
2. The ability to retrieve a specific object given a unique identifier. This is necessary to allow retrieval of a cached object when an action needs to be performed on that object. The convention is to let the unique identifier be the same as the accessible child ID so that AccessibleObjectFromEvent() can be used to retrieve an object by unique identifier.
3. Caret tracking in editable text controls. MSAA only exposes the text of editable text controls. It does not provide a way for the AT to determine the position of the caret within that text. This means that cursoring around or deleting characters in the control is not accessible with ATs.
4. Access to table information. MSAA does not provide a standard way to expose table information, such as row and column counts and coordinates.

IAccessible2 (http://www.linuxfoundation.org/collaborate/workgroups/accessibility/iaccessible2) complements MSAA (IAccessible), facilitating the missing functionality outlined above and much more. Implementing IAccessible2 in WebKit would facilitate access by the NVDA screen reader (http://www.nvda-project.org/) and potentially improved access for other ATs and screen readers.

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