v134 ยท privacy sandbox
Cross-campaign Deduplication
A Shared Storage worklet that reads interestGroups() can avoid double-counting users who match more than one campaign. Run the mock reach walk to see every user, matching interest groups, the overcount baseline, and the deduplicated count the worklet would contribute.
simulation not run
Chrome 134 adds
sharedStorage.interestGroups() inside the worklet. That lets reach measurement ask, "which campaigns does this browser belong to?" and contribute only the first matching campaign instead of counting the same browser once per campaign.
Example audience table
Run deduplication walk
Reach result
| User | Matching IGs | Matching campaigns | Already counted? | Action |
|---|
Worklet code shape