See tests at https://github.com/web-platform-tests/wpt/pull/29745 , which WebKit is passing with the exception of this particular case.
<rdar://problem/82035810>
Created attachment 435890 [details] WIP patch
This patch modifies the imported WPT tests. Please ensure that any changes on the tests (not coming from a WPT import) are exported to WPT. Please see https://trac.webkit.org/wiki/WPTExportProcess
Created attachment 436227 [details] Patch
Committed r281502 (240875@main): <https://commits.webkit.org/240875@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 436227 [details].