Sticky table header dont work within an element with overflow set (e.g. tabs)

I can't figure out about which tabs and overflow you talking. Just did everything:

- install webform module
- enable webform and webform_templates submodule
- go to /admin/structure/webform/templates
- scroll down and check sticky header

and table header is sticky on scroll

Regarding that fact that overflow != visible removes position sticky behavior - it's clear. Just need to understand how exactly it can be reproduced (when table can live in the element with overflow hidden for example)

I've been able to reproduce this. header with position: sticky and child with overflow auto gives problems with the header positioning. for now i've created a local patch removing the overflow: auto to overflow: clip. so i at least have a functional page.

Facing this issue.

Can someone please specify the steps again to reproduce this issue. Because I'm unable reproduce the issue with the steps mentioned in the IS. Steps followed:-

1. Installed and enabled Webform and Webform Template modules.
2. Navigated to /admin/structure/webform/templates.
3. Scrolled the table.
4. Table header is positioned at the top on scroll as sticky header.

Attaching a screen recording for reference. Also, noticed that the table is not within the .tabs in this case. Please correct me if I'm not correctly understanding the issue.

Is there any other scenario where this issue can be reproduced in D11? Because Webform module is not compatible with 11.x yet.