See spec change at https://github.com/whatwg/html/pull/3960 (live at https://html.spec.whatwg.org/#window-open-steps) and tests at https://github.com/web-platform-tests/wpt/pull/12577. Corresponding Chromium implementation is at https://chromium-review.googlesource.com/c/chromium/src/+/1180296.
We fail these new tests.
<rdar://problem/96321158>