Compare descendant (element element) with child (element>element) selector.
Find a needle in a hey stack, child>selector
re-load()
||
Change Div1 and Div2
||
Div3:Descendants
 ||
Div3:Selected Child Only
Div1
Art
Biology
Chemistry
An Anchor
Debate
Div2
Earth
Fire
Globe
Health
Div3
Earth
Fire
Water
Globe
Health