1.  This is a simple table
(1 col x 1 row, 220 pixels)
2.  This is a simple table with background color.
3.  This is a simple table with color and no gridlines.
4.  All the tables are in a larger host table that is unseen...
5.  ...unless the surrounding (host) cell is colored in...
6.  ...and the guest table colored also to make a frame.
7.  The host cell for this table has been expanded across 2 columns.  The middle cell had to be deleted first...
8.  ...while the host cell for this table remains intact.
9.  Now the left host cell has been restored...
10.  ...while the other cells have merged.  This time the right cell was deleted, and the middle expanded to fill the gap.
11.  The host cell for this table has been expanded vertically, spanning 1 column and 2 rows of the host table.  The bottom cell was deleted, and the top expanded down.
12.  Yet the middle parent cell remains  intact.  You can...
13.  ...tell because the guest tables look the same.
14.  When dealing with... 15.  ...tables inside tables...
16.  ...the only limits are those of imagination.

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