1. what is excecution context? active object?

2. scope chain

3. scope chain argumentation? with and try … catch

4. dynamic scopes

function execute(code) {
function subroutine(){
return window;
var w = subroutine();
//what value is w?

5. closure scope and memory

6. QuerySelectorAll() and querySelector()

7.  repaints and reflows

Dom tree and render tree

8. queueing and flushing render tree changes.

9. batching dom changes

1. Take the element off of the document flow.  make display to be none
2. Apply multiple changes.
3. Bring the element back to the document

10. createDocumentFragment

11.event delegation

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