Admin: Incorrect CSS selector in about.css causing unintended styling

[passoniate]

While reviewing the admin CSS file (wp-admin/css/about.css), I found an incorrect selector:

Fix incorrect CSS selector in about.css causing unintended styling.

[sabernhardt]

Could you share what is displaying incorrectly?

I do not find the .about-wrap class used anywhere now. [45278] added the .about-wrap .column :first-child selector for WordPress 5.2, and then 5.3 replaced the .about-wrap class in [46616].

Instead of updating the CSS we have to remove that CSS. See https://core.trac.wordpress.org/ticket/64257#comment:2

[ryelle]

This is in the legacy CSS. It was decided as part of the layout restructure in [46616] to not remove this CSS as some plugins used the about layout markup for their own update pages. By now we can likely remove this whole section of CSS ("x.2.0 - Legacy About Styles: Global" and below), but I would suggest opening a new ticket for that & getting it in early next release.

The selector in question is also not wrong — it's meant to reset the margin on the first item inside a column.

[sabernhardt]

some plugins used the about layout markup for their own update pages.

A directory search found ​hundreds of plugins that have used the .about-wrap class, and likely many of them still depend on the legacy CSS.

Closing per https://core.trac.wordpress.org/ticket/64257#comment:6