https://webmasterid.com/privacy-analytics/partitioned-cookies-deep
Partitioned cookies (CHIPS) in depth ยท WebmasterID
Partitioned cookies key storage to the top-level site, so a third-party cookie set on site A cannot be read when the same embed loads on site B.
partitioned cookieschips indepth
https://searchfox.org/firefox-main/source/testing/web-platform/tests/cookies/partitioned-cookies/partitioned-cookies-parallel-iframes.embed.tentative.https.html
partitioned-cookies-parallel-iframes.embed.tentative.https.html - mozsearch
partitioned cookiesparalleliframesembedtentative
https://cookie-script.com/blog/partitioned-cookies/amp
What Are Partitioned Cookies?
partitioned cookies