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[Bug 27263] New: addHitRegion should inform the user of the new location for the fallback element based on the associated hit region

From: <bugzilla@jessica.w3.org>
Date: Fri, 07 Nov 2014 01:41:29 +0000
To: public-html-admin@w3.org
Message-ID: <bug-27263-2495@http.www.w3.org/Bugs/Public/>

            Bug ID: 27263
           Summary: addHitRegion should inform the user of the new
                    location for the fallback element based on the
                    associated hit region
           Product: HTML WG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: CR HTML Canvas 2D Context
          Assignee: dave.null@w3.org
          Reporter: mark@w3.org
        QA Contact: public-html-bugzilla@w3.org
                CC: public-html-admin@w3.org

It was originally decided [1] that calling addHitRegion() should update the
location information for the fallback element with the location of its
corresponding hit region:

> RS: updating location information in Accessibility APIs
> <richardschwerdtfeger> Updating the accessibility API of the
> location of fallback elements that are representative of the
> corresponding hit region location.

However, this text was never added to the spec.  The oversight was pointed out
and discussed here [2]

I propose the following step be added after step 12 in addHitRegion() [3]

13. If the arguments object's control member is not null, inform the user of
the location of the region representing the control given by the control
member's value for this canvas element, if any. The full location of the
corresponding fallback element, pertaining to the control, as represented by
the region is passed to the accessibility API, if supported. 

Optionally, we could add non-normative text similar to that which is included
with drawFocusIfNeeded():

Note: "Inform the user", as used in this section, could mean calling a system
accessibility API, which would notify assistive technologies such as
magnification tools. The methods above allow the user agent to report the
bounding box of the path as the bounds of the element passed as an argument.

[1] http://lists.w3.org/Archives/Public/public-canvas-api/2014AprJun/0039.html
[2] http://lists.w3.org/Archives/Public/public-canvas-api/2014JulSep/0033.html
[3] http://www.w3.org/TR/2dcontext/#dom-context-2d-addhitregion

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