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This page tests what observable information is exposed when a tracker URL is blocked.

The goal is to ensure that after refactoring request blocking, websites see identical errors and cannot detect any change.

Tested domain: bad.third-party.site (blocked tracker) broken.third-party.site (tracker, not blocked) good.third-party.site (non-tracker) allowlisted.third-party.site (allowlisted) www.first-party.site (first-party)