In the example, I have two tables with three columns (defined with the "col" tag). In the both tables, I have a row without a third cell, and the second cell with colspan=2. In the first table, I have a row with a third cell. In the second, I do not. Note the rendering differences between the two tables. FF and IE don't have this behavior.
<rdar://problem/6047082>
Created attachment 461594 [details] Safari 15.6 matches with other browsers I am not able to reproduce this bug in Safari 15.6 on macOS 12.5 and as can be seen from attached, all browsers match each other. I am going to mark this as "RESOlvED CONFIGURATION CHANGED". Thanks!