[BUG] Desktop app (Windows): pointer lock doesn't work in the built-in browser pane #103216

Preflight Checklist

• I have searched existing issues and this hasn't been reported yet
• This is a single bug report (please file separate reports for different bugs)
• I am using the latest version of Claude Code

What's Wrong?

In the Claude desktop app (Windows 11, Code tab), pages opened in the built-in browser pane can't use pointer lock: requestPointerLock() has no effect, so mouse look in a first-person WebGL game doesn't work.

The same pages work in the browser pane of the web version (claude.ai/code) and in Chrome.

What Should Happen?

Clicking the canvas locks the pointer, and mousemove events report movementX/movementY, like in the web version's browser pane.

Error Messages/Logs

Steps to Reproduce

1. In the Claude desktop app on Windows, open the built-in browser pane on MDN's pointer lock demo: https://mdn.github.io/dom-examples/pointer-lock/
2. Click the canvas.
3. Move the mouse.

Result: no pointer lock, the ball doesn't move.
The same steps in the claude.ai/code browser pane work.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

Claude desktop app for Windows (auto-updated, Oct 2026)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

No response