If you are in creative mode and go into the world and dig into the void, you will start falling but eventually stop on this surface but you don't die. The surface is made of invisible blocks that can't be broken and also blocks cannot be placed.

Note: This affects 0.11.1 but I'm not sure about 0.11.0. I put 0.11.0 because I couldn't select 0.11.1 in Released Versions or Unreleased Versions.

I also cannot provide a picture as I cannot take screenshots