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On Windows, OuterDocAccessible::GetChildAt can return a proxy wrapper for a remote document. These aren't real Accessibles and shouldn't be returned except to the Windows a11y code (which doesn't use eDeepestChild). Calling ChildAtPoint on these will crash! Therefore, just return null in this case. Differential Revision: https://phabricator.services.mozilla.com/D39135 --HG-- extra : moz-landing-system : lando