Preparing for a more private web
summary
Browsers phase out third-party cookies and propose Privacy Sandbox APIs as privacy-preserving replacements; partitioned cookies and a partition attribute aim to keep third-party cookies scoped by top-level site, while origin trials let sites register a token in meta or headers to test new APIs in production. Adopt the good-cookie recipe (Host prefix, Secure, path=/, HttpOnly, SameSite=Lax), migrate to User-Agent Client Hints, use Chrome DevTools Issues tab, and evaluate Attribution Reporting experiments like Yahoo Japan’s.
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