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Sites are included in the FLoC origin trial (i) if they are detected as using ads-related resources or (ii) use the FLoC API (
await document.interestCohort()). Case (ii) is easy to determine. Case (i), too, if you know how. @rowan_m explains the steps in the quoted tweet: ⤵️ x.com/rowan_m/status/1383380295336878091