Over, not beside
This block starts at column six and row four. The picture runs from column one to nine and row one to six. They share the overlap because both were told to, not because one was dragged.
A panel breaking out
Two items in one cell paint in document order, so the lift class says which is on top out loud. Reorder this markup to read better aloud and the picture does not change.
Two plates sharing a corner
Explicit rows are the price
With automatic rows, row three is wherever the content above it happened to end. A fixed row unit makes row three the same place for every item, which is the only way two of them can be told to meet.
