The user interface component of the toggle button to expand or collapse the navigation sidebar is not clearly distinguishable as a button and might go unnoticed cuz the caret facing to the left for LTR also has a lower contrast against the background compared to the caret facing to the right for every top level menu item that contains sub menu items (See the table in
https://docs.google.com/spreadsheets/d/1won35PxhRFexJYE8FmZ4DCNTo7xEAxC8... or
toggle_button.xlsx.zip →
for more details).
Discussed and iterated on the issue with @mgifford, @the_g_bomb, @katannshaw, and @drupa11y
Active
4.0
User interface
It affects the ability of people with disabilities or special needs (such as blindness or color-blindness) to use Drupal.