[Webkit-unassigned] [Bug 97825] New: AX: labelForElement is slow when there are a lot of DOM elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=97825

           Summary: AX: labelForElement is slow when there are a lot of
                    DOM elements
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: dmazzoni at google.com


See related bug: https://bugs.webkit.org/show_bug.cgi?id=33253

Currently AccessibilityNodeObject::labelForElement, which is used to find the <label> associated with a focusable control, scans all of the nodes in the DOM tree to find possible labels, which can be inefficient. This function shows up as a bottleneck when I run various Chrome benchmarks with accessibility enabled.

Proposed alternative: AXObjectCache should maintain a hash map from label id to label element. It should be generated lazily the first time it's needed, then updated every time a label is modified or deleted.

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