[Webkit-unassigned] [Bug 68285] New: Use RenderedPosition instead of VisiblePosition in accessibility code

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=68285

           Summary: Use RenderedPosition instead of VisiblePosition in
                    accessibility code
           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: rniwa at webkit.org


Per IRC discussion, we should move away from VisiblePosition and use RenderedPosition in accessibility code.

RenderedPosition has the following benefits:
1. It does not canonicalize positions unlike VisiblePosition so we can fix bugs like https://bugs.webkit.org/show_bug.cgi?id=57685
2. It's performant since it doesn't trigger layout or spends time doing canonicalization

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