Facebook has been experimenting with (and subsequently put back) changes in the Messenger user interface over the past few months. Throughout all these tests, the most vocal question we saw from our own readers was a dark mode to better complement the dazzling white design. Now, according to the acclaimed app expert of social app Jane Manchun WongFacebook Messenger is finally starting to test a dark mode – but only in some countries, and it is still incomplete.

We do not know the list of supported countries, so YMMV. As far as we can see in our own tests, the US is not included. As a result, we also do not know for sure what it looks like.

If you are in a supported country based on the Wong screenshot, a new "Dark Mode" setting should appear in the "Me" section of the app. A warning indicating that the new dark mode is still a work in progress will also appear – although it is not immediately clear whether that message appears when switching the setting, or when loading the section it contains.

Screenshot of the warning that appears, switch visible below.

If you are in one of the supported countries and you decide to turn the switch around, you will need to be careful during the night because the incomplete version of the dark mode may unexpectedly dazzle you.

The new mode looks as you would probably expect, replacing all the grim and bright white backgrounds with black and turning text from black to white. The search bar and some other rounded UI elements remain gray, but darker. On the basis of the screenshots provided, some parts of the interface are still white at some places.

Collage of the new dark mode from different places in the app @wongmjane.

Although the new dark mode is still in the test phase, it seems that Facebook is pretty far with it. Hopefully it will quickly drop to everyone.