ESS Position is the smallest input the game can register that makes Link move. When holding ESS, Link will turn around and shuffle his feet on the spot, unless you started holding ESS while targeting. An interesting and extremely useful effect of ESS Position is that it allows us to maintain speed.
A FESS is the fastest form of ESS Sliding in MM3D. A FESS can easily be performed by holding ESS, taking damage from an explosive (usually bombs) and pressing L right after.
Due to the changed rolling in MM3D, an ESS with the speed of a HESS is impossible. You can get a backwards ESS, however the speed is actually slower than a FESS.
Using ESS position, it is possible to dupe bottles over items and masks. To ESS Dupe, have a bottled item in your hands (Fish/Bugs are good because you can try again if you fail, water is great if you are near water) and hold ESS position. It is best to target after getting ESS, because then Link will shuffle his feet indefinitely until letting go of ESS. Then, press the bottled item and the item you want to dupe over in very rapid succession. If done correctly, the item should become an empty bottle.