The table's Safari column was WebKit through Playwright, which is the engine
but not the browser: ITP is a Safari layer above it and could have been
stricter. Driven through Safari 27's own WebDriver, all three configurations
match the WebKit result exactly, so the column now says Safari and means it,
and the e2e suite's WebKit coverage is a faithful proxy for this behaviour.
Safari blocks third-party cookies out of the box and still honours Partitioned:
with the header flag the widget's own cookie is readable inside the frame and
the reload keeps the reader signed in, while the control cookie written beside
it is dropped.
Dmitry Verkhoturov
a7e7ab4c8e