I have basic understanding of dom tree, flat tree, css tree and layout tree.

1) I wanted to know when we add a child node in some parent node i.e when 
we update the dom then which tree is affected ? and is there any tree that 
can give us detla change that is done by dom update ?

I guess blink updates the flat tree first with addChild method from "Node" 
class and then updates the layout tree directly, is this right ?

Is there any place in blink code where we can get delta change made in flat 
tree ?

2) Also If I change color of certain div in dom then Where does css gets 
updated ? how to know which property for which element is dirty and catch 
that delta change ?

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