Change:
outline-offset: -5px; } <ins> .monaco-workbench .part.editor > .content .editor-group-container.active > .title .tabs-container > .tab.active:focus { outline-style: dashed; } </ins> .monaco-workbench .part.editor > .content .editor-group-container > .title .tabs-container > .tab.active { outline: 1px dotted; outline-offset: -5px;

Discussion:
<!-- Do Not Delete This! bugreporttemplate --<!-- Please read our Rules of Conduct: --<!-- Read our guide about submitting issues: --<!-- Search existing issues to avoid creating duplicates. --<!-- Test using the latest Insiders build to see if your issue has already been fixed: --<!-- Instead of creating your report here, use 'Report Issue' from the 'Help' menu in VS Code to pre-fill useful information. --<!-- Launch with to check. --<!-- If you answered No above, use 'Help: Start Extension Bisect' from Command Palette to try to identify the cause. --<!-- Issues caused by an extension need to be reported directly to the extension publisher. The 'Help Report Issue' dialog can assist with this. --“! – Identify accessibility bugs before check-in and make bug fixing faster and easier.” GitHubTags: #A11yMAS; #A11yTCS; #A11ySev2;#BM-VisualStudioCode-Win32-Nov2021;#Visual Studio Code Client;#Win11;#FTP;#DesktopApp; Visual Studio Code – Insider Version: 1.81.0-insider (user Setup) OS Version: Microsoft Windows 11 Enterprise (.1992) Change system high contrast to aquatic. Visual Studio Code in your system to the explorer and press ctrl+ alt+windows+n to add a new text file ctrl+M to activate the tab navigation shift tab for the editor of the text file and move the close button of the untitled tab. one more shift tab and check if the keyboard focus is visible on the screen. In high contrast mode, focus is not visible on "untitled-1" tab In high contrast mode, focus should be visible on "untitled-1" tab Keyboard users and low vision users will finds difficult while working if they are unable to see the focus visibility on "untitled-1" tab
this works just fine for me. What are you doing differently? Your attachment failed to upload. A simple screenshot or gif should be enough. Thanks! !
i have updated the attachment now can you please check once.
Ok so repro steps: contrast theme focus on editor tab yellow border outline is already rendered because the file is open. So we can not render the focus on top of it.

The tab is rendered the same way if there is focus or not Assigning first to since this feels like a theme bug. We could fix by using a dotted line to indicate open tab, and when it gets focus that it gets a full line or something like that? We have to fix this in the next 2-3 milestones due to a11y requirements.
I find these can get lost without a milestone
One challenge I see here is how we handle active and focus states across active and inactive editors. Active, unfocused editors use a tab outline in hc themes. Active, focused editors, use . We could use for the active and reserve solid for focused? <img width="602" alt="CleanShot 2023-08-29 at 15 06 32 src=""
This sounds like a good approach to me
I think I've landed on a good path forward here. Active, focused editors retain a solid border style. Explicitly focusing on the tab via keyboard nav will draw a dashed border. Focusing on the editor itself will restore the solid state:
closing the bug as the issue is fixed. GitHub:#Closed;