July 21, 2026  |  SIGN UP

Ronan Shields
SENIOR REPORTER, AD TECH

The W3C’s proposed Attribution API aims to enable privacy-preserving advertising measurement without cross-site tracking, but has reopened debate over browser governance and competition. 

Now in wide review, the proposal would provide a browser-based method for measuring ad performance while limiting user tracking. 

Supporters argue it is an open web standard that expands advertisers’ measurement options and supports media investment. Critics, however, contend it closely resembles Google’s Privacy Sandbox Attribution Reporting API.

Parties, such as Movement for an Open Web, warn that browser-mediated attribution could concentrate too much control within browser platforms, reduce transparency and hinder competition and innovation. 

However, Aram Zucker-Scharff, co-chair of the W3C’s PAT Working Group, says the work predates Privacy Sandbox and has been developed through an open standards process. 

The debate ultimately centers less on privacy than on who should govern the future of digital advertising measurement. Read more here. 

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