Tests to ensure that event dispatching behaves as the Shadow DOM spec describes.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


Composed Shadow Tree will be:
DIV	 id=sandbox
	DIV	 id=top
		DIV	 id=A
			DIV	 id=D


Click C

  click
     @C (target: C)
     @B (target: C)
     @orphaned-shadow-root (target: C)
     @A (target: A)
     @top (target: A)

Click non-distributed-node

  click
     @non-distributed-node (target: non-distributed-node)
     @A (target: non-distributed-node)
     @top (target: non-distributed-node)
PASS successfullyParsed is true

TEST COMPLETE