Doorskip

A doorskip involves going Out of Bounds by going past the door transition blocks.

This is sometimes done by accident during 100% runs during the Gauntlet Spark from Landing Site, by pausing on a specific frame.

This is also done by pausing on a specific frame before the door transition at the bottom of Parlor, and then expanding Samus' hitbox as you pass the transition blocks. One setup for this is shown in the route video linked from 3%, another setup is shown in this tutorial for the current fastest route for Any% Glitched.