v152 · privacy-sandbox · ads · deprecation
Deprecate and remove: Attribution Reporting API
Chrome 152 begins the stepped removal of the Attribution Reporting API (ARA), a Privacy Sandbox API designed to measure ad conversions without third-party cookies. Following Chrome's decision to maintain third-party cookies, ARA and other Privacy Sandbox APIs are being removed.
at a glance
| Shipped in | Chrome 152 (Stepped rollout — removal begins) |
|---|---|
| Status | Deprecation / removal in progress |
| Standards position (Firefox) | No signal |
| Standards position (Safari) | No signal |
| ChromeStatus | 6320639375966208 — Deprecate and remove: Attribution Reporting API |
background
The Attribution Reporting API (ARA) was a Privacy Sandbox proposal that allowed ad networks to measure click and view conversions without third-party cookies or cross-site tracking. It used two report types:
- Event-level reports: coarse, noisy conversion data sent after a delay.
- Aggregatable reports: encrypted summaries processed through a trusted aggregation server.
ARA was designed as a privacy-preserving replacement for cookie-based measurement in a cookieless future. Following Google's announcement that Chrome will maintain support for third-party cookies, the core motivation for ARA no longer applies and it is being removed along with other Privacy Sandbox APIs.
Source: chromestatus feature summary; Privacy Sandbox next stepswhat is removed
| Component | Status |
|---|---|
attributionsrc HTML attribute on <a>, <img> | Removed |
Attribution-Reporting-Register-Source HTTP header | Removed |
Attribution-Reporting-Register-Trigger HTTP header | Removed |
| Event-level and aggregatable reports | No longer sent |
registerAttributionSource() JS API | Removed |