Hello,
When using the wikitable class with the Timeless skin, CSS styles applied on table rows are apparently ignored.
- Go to https://fr.wikipedia.org/wiki/Utilisateur:Seudo/TestTableStyle, which displays 3 tables
- If you are not using the Timeless skin on the French Wikipedia, the 1st row in each table has a green background
- If you are using the Timeless skin, the 1st row on table 1 has no green background, while the 1st row in the Table 2 and 3 have a green background.
Only the 1st table has the "wikitable" class.
When using the Firefox inspector, I saw that the wikitable class, when using the Timeless skin, has the following rule:
.mw-datatable > tr > td, .wikitable > tr > td, .mw-datatable > * > tr > td, .wikitable > * > tr > td { background: #f8f9fa; }
I guess that may be the source of the problem, but I am not sure. I am using Firefox 70.0, but also saw the same behavior on other browsers such as Android/Opera.