Steps to reproduce:
- On a desktop machine, open Chrome in incognito mode.
- visit http://wikitech.wikimedia.org/wiki/
The desktop version of the site should load.
The mobile version of the site loads. The developer toolbar claims I have no cookies (as expected in incognito mode).
- Chrome 65.0.3325.146, 64 bit, Ubuntu 16.04
- Chrome 65.0.3325.162, 64 bit, MacOS 10.13.3