This is an "x-ray" glitch. https://www.youtube.com/watch?v=oTGPd9Pmqtw&feature=youtu.be
As people say it looks as if i am x-raying. anyways you must mine an L shape and put the fence in the large part of the L, then on the bottom right dig down again so its 3 blocks. Next you must place glowstone on the fence, on you. The most important step is now, filling the 3rd space you dug on the bottom of the L.

There are about 3 versions of this, but i will combine 2 in 1. dig a hole straight down and set a warp of home. cover the spot you set the home in golwstone, exit the hole, warp back. done. Note: Glowstone can be 2 blocks or 1. if one, space must be under so flowstone is "eye level".

Tip: works better if gamma is high

How i found it: My job is to find glitches for the server i work on, this is the first i found on your end, many tend to do with plugins. I happened to be just messing around when i found the 2nd and 3rd version. Version with fence is older.

I apologize for the poorly done video as well as report, as i am a nub.