Same as for the drop button, this issue is not necessarily a compliance one. But the problem is, that the background of the bulk action bar is close to the background layer color wise and therefore the color contrast is rather low. That way it is easily possible that the appearance of the bulk action bar goes unnoticed when a user is selecting an entity.
In comparison Claro uses a clearly visible dark bulk action bar with a rather large color contrast, that way when the component is showing up it is immediately perceived (See the table in https://docs.google.com/spreadsheets/d/1won35PxhRFexJYE8FmZ4DCNTo7xEAxC8... or bulk_action.xlsx.zip → for more details).
Discussed and iterated on the issue with @mgifford, @the_g_bomb, @katannshaw, and @drupa11y
admin/content and select an entity so the bulk action bar shows upActive
4.0
User interface
It affects the ability of people with disabilities or special needs (such as blindness or color-blindness) to use Drupal.
The background color for the ViewBulk actions in the Gin admin theme is being overridden by other styles that were specifically designed for the Gin theme.
If we remove these core ViewBulk actions styles, the default styles (like those in Claro) will be applied, where the background color is #232429.
Should we update the Gin ViewBulk action background color to match Claro's, or should we increase the contrast of the existing color?