According to tests, this feature is disabled in Chromium but enabled in Chrome. You can test it here https://data.bablosoft.com/features/ , keys: AttributionReporting, FencedFrames, FencedFramesAPIChanges, Fledge, PrivacySandboxAdsAPIs, SharedStorageAPI, TopicsAPI, TopicsDocumentAPI, TopicsXHR. Or by running the code described here https://developer.chrome.com/en/blog/privacy-sandbox-unified-origin-trial/#how-should-developers-feature-detect-api-support
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