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Security: In modern browsers, access between different origins (domains) can be restricted by the CORS policy.

Performance: The loop may execute several times, but typically the window hierarchy is not deep.

Edge case: If the container is not found in any window, the topmost window will be returned.

Security: In modern browsers, access between different origins (domains) can be restricted by the CORS policy.

Performance: The loop may execute several times, but typically the window hierarchy is not deep.

Edge case: If the container is not found in any window, the topmost window will be returned.
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