Problem/Motivation

This is a followup for #2848507: Indicate that grouping elements have child element errors for ux and a11y to make the changes specifically in Default Admin. It's postponed on #3582351: [Meta] Clean up CSS.

Child elements in grouping elements like (meta) details and vertical tabs are invisible to the user when the grouping element is closed or not-focused respectively.
To improve the user experience and accessibility we should indicate when there are errors 'inside'.
Currently it is hard for the user to find the actual problematic field when the (child) field itself is invisible.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet

Comments

kentr created an issue. See original summary.