Created attachment 50122 [details]
If I specify 'outline' for a TR it does not show.
It does show however if I specify it for one TD inside that row.
Created attachment 50124 [details]
The table rendered with Safari
Created attachment 50125 [details]
Created attachment 50126 [details]
The table rendered with Firefox
This was fixed by bug 71944 that added support for outline on most table parts (including rows).
The test passes for me and IMHO is properly covered by the tests landed as part of bug 71944 so marking as a duplicate. Thanks for the report!
*** This bug has been marked as a duplicate of bug 71944 ***