The tab element in focus should have a visible outline around it to enable the user to visually determine the component on which keyboard operations will interact at any point in time.

鈽濓笍 expected output when the sharing tab is focused with the keyboard
There is no visual indicator of the element that currently has keyboard focus

For this image, when a user interacts with the keyboard, it is not possible to tell which element they would be interacting with.
Operating system: Ubuntu 16.04
Nextcloud version: 13.0.4
Updated from an older Nextcloud/ownCloud or fresh install: Fresh install
Where did you install Nextcloud from: snap install nextcloud
GitMate.io thinks possibly related issues are https://github.com/nextcloud/server/issues/2096 (Readability / Distinction of currently selected element on right sidebar), https://github.com/nextcloud/server/issues/3632 (Unable to login using FreeIPA users with 2FA Enabled), https://github.com/nextcloud/server/issues/9005 (c), https://github.com/nextcloud/server/issues/9154 (Unable to use SCSS for apps which operate on the login screen), and https://github.com/nextcloud/server/issues/3049 (Hiding navigation bar).
cc @nextcloud/designers
@kevgathuku thank you for the feedback, I will look into it! :) You are also welcome to contribute a fix if you like, I am happy to help.
Thanks @jancborchardt
I'll work on a fix, and I'll make sure to ask any questions that may come up 馃槂
Fixed in #9956
It鈥檚 awesome when the person who finds the issue also fixes it! :) High five @kevgathuku