After 267270@main it passes on macOS with a fuzzy diff around the border of the iframe.
<rdar://problem/114460209>
Pull request: https://github.com/WebKit/WebKit/pull/17074
Test gardening commit 267296@main (5667e62138fe): <https://commits.webkit.org/267296@main> Reviewed commits have been landed. Closing PR #17074 and removing active labels.