Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a bug report that matches the one I want to file, without success.

Electron Version

40.2.1

What operating system(s) are you using?

Windows

Operating System Version

Microsoft Windows [Version 10.0.26200.6899]

What arch are you using?

x64

Last Known Working Electron version

38.8.0

Does the issue also appear in Chromium / Google Chrome?

No

Expected Behavior

DevTools popup UI should work normally inside the custom detached DevTools window, including:

• Toolbar dropdowns (e.g. Console filters)
• Overflow/chevron menus (e.g. >>)
• Right-click context menus in panels

Actual Behavior

DevTools opens and panels render, and controls show hover/pressed/active states, but menus/popups never appear when clicked. This affects multiple DevTools UI elements, suggesting a general popup/menu rendering issue rather than a single panel bug.

Testcase Gist URL

https://gist.github.com/6e3cb66842c73197073debfa83c98e27

Additional Information

When hosting Chromium DevTools in a custom BrowserWindow using webContents.setDevToolsWebContents() and opening DevTools in detached mode, the DevTools UI renders and is mostly usable, but popup menus do not open (dropdowns, overflow chevrons, context menus, etc.).