We are working to ship a new client hint, form-factor, in Blink. Please let us know if you have any questions or comments.

You can check the following documents for details:
* https://github.com/djmitche/web-explainers/blob/main/sec-ch-ua-form-factor.md
* https://wicg.github.io/ua-client-hints/#sec-ch-ua-form-factor

Dustin