Major · Platform Policy · Attribution
Apple’s WebKit identity-resolution block puts iOS measurement under pressure
Apple is transitioning WebKit to a dynamic, rules-based system that blocks web-based identity-resolution services. The change applies across iOS browsers because they must use Apple’s browser engine, potentially affecting how marketers and vendors handle attribution, measurement and targeting. The supplied analysis distinguishes the move from App Tracking Transparency and notes that it does not favour an Apple-owned web advertising product.
Why it matters: Marketers and their vendors may need to reassess identity, attribution and measurement strategies for iOS web traffic, with implications extending beyond a single advertising product or browser. The likely operational and strategic consequences are substantial and long-lived, but confidence is moderated by the single-source evidence base and limited implementation detail.

