Web Development 
Description
IMPORTANT: Javascript must be ON to test the Layout UI.
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Insert
The insert function inserts new divisions in the targeted division. You can insert a horizontal and vertical division anywhere it makes logical sense.
Layouts are made of pairs of divisions.
Layout design is logical but flexible.
Just as the resizing function can be applied across multiple divisions if you navigate up the tree, divisions can be inserted across multiple divisions or even across the entire layout.