[Webkit-unassigned] [Bug 131920] New: AX: expose (heading) level based on heading elements outline depth

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=131920

           Summary: AX: expose (heading) level based on heading elements
                    outline depth
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: faulkner.steve at gmail.com
                CC: jcraig at apple.com, webkit-bug-importer at group.apple.com


Currently the HTML5 outline algorithm [1] is not implemented, propose implementing and exposing as a DOM method  so developers and 3rd part software such as assistive technology can provide a document outline to users. 

The HTML5 outline algorithm is implemented in conformance checkers:
http://validator.w3.org/nu/ 
https://github.com/validator/

and browser extensions:
https://chrome.google.com/webstore/detail/html5-outliner/afoibpobokebhgfnknfndkgemglggomo?hl=en

[1] http://www.w3.org/html/wg/drafts/html/master/sections.html#outlines

Implement 'heading role, with the aria-level property set to the element's outline depth' as per  
http://www.w3.org/html/wg/drafts/html/master/dom.html#sec-implicit-aria-semantics

Acc API mappings
http://rawgit.com/w3c/html-api-map/master/index.html#el-h1-h6

* MSAA + IAccessible2 *
Role:  IA2_ROLE_HEADING 
Object attributes:  level:<heading_level> 
Interfaces:  IAccessibleText2; IAccessibleHypertext2; 

*ATK*
Role:  ATK_ROLE_HEADING 
Object attributes:  level:<heading_level> 
Interfaces:  AtkText; AtkHypertext  

*AX*
AXRole: AXHeading 
AXSubrole: (nil) 
AXRoleDescription: "heading" 
Properties: Use AXLevel to expose the heading level

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