Google is testing yet another user interface test, this one is where the top thin black bar can be removed completely.
Now you can remove it by adding ?esrch=Agad::Public to the end of the Google URL.
Here are pictures with and without he black bar:
Google also recently started testing a top bar navigation.
Past Google User Interface Tests:
- Google Testing Toggle For Search Options & Tools In Search Results
- Google Moves Away From Large Navigation Drop Down Menu
- Google’s New Black Menu Bar Is Now Google’s Old Black Menu Bar
- Confirmed: Google Testing New “Sources” Display In Search Results
- Google Tests New Drop Down Navigation Bar From Google + Logo
- Google Tests Tabbed Navigation Design For Tablets