[Webkit-unassigned] [Bug 243373] New: AX: An unnecessary group is created for every block-flow box with no other useful AX semantics

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243373

            Bug ID: 243373
           Summary: AX: An unnecessary group is created for every
                    block-flow box with no other useful AX semantics
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tyler_w at apple.com
                CC: andresg_22 at apple.com,
                    webkit-bug-importer at group.apple.com

At the end of AccessibilityRenderObject::determineAccessibilityRole, we have this logic:

if (m_renderer->isRenderBlockFlow())
   return m_renderer->isAnonymousBlock() ? AccessibilityRole::TextGroup : AccessibilityRole::Group;

This causes us to create a group from every block-flow box that doesn't otherwise have any useful AX semantics. This is problematic because:

  1. It makes the AX tree diverge from the DOM in a way that makes inserting node-only children (e.g. those with display:contents) at the right index in AccessibilityRenderObject::addNodeOnlyChildren hard or impossible
  2. Causes wasted work for WebKit by having to created isolated objects for these unnecessary groups
  3. Causes wasted work for AX clients who have to filter through these semantics-less groups

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