Full Answer

CNAME cloaking worked briefly because it disguised a third-party tracker behind a subdomain you appeared to own. You would create track.yoursite.com and point it, via a CNAME record, at a tracking vendor's infrastructure. For a window around 2018-2019, Safari saw the subdomain and treated its cookies as first-party. That window closed with ITP 2.3.

Safari now resolves the full CNAME chain. It maintains a classification of known tracking hosts and cross-references where your subdomain actually points. If the chain terminates at a recognised tracker, Safari downgrades the cookies to the same 7-day cap it uses for third parties, and WebKit has extended the same treatment to bounce-tracking and link-decoration workarounds. Each ITP release has added detection, never removed it — betting on the next loophole is a losing position.

The durable alternative is not a disguise, it is genuine first-party architecture: a server you control, on a domain you own, setting cookies through HTTP response headers rather than JavaScript. HTTP-set first-party cookies are not subject to the 7-day JavaScript cap, and conversion events sent server-to-server reach ad platforms regardless of what the browser blocks. That is the distinction explored in Seresa's [server-side tracking plugins comparison](https://seresa.io/blog/woocommerce-tracking/wordpress-server-side-tracking-plugins-compared-2026). The real question is not how to trick Safari — it is whether your tracking depends on the browser's cooperation at all.