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=shadow-host
			DIV	 id=distributed-light-child
			DIV	 id=shadow-root-child


Moving mouse from shadow-host to shadow-host/shadow-root-child

  mouseout

  mouseover
     @shadow-root-child (target: shadow-root-child) (related: shadow-host)
     @shadow-root (target: shadow-root-child) (related: shadow-host)

Moving mouse from shadow-host/shadow-root-child to shadow-host

  mouseout
     @shadow-root-child (target: shadow-root-child) (related: shadow-host)
     @shadow-root (target: shadow-root-child) (related: shadow-host)

  mouseover

Moving mouse from shadow-host to distributed-light-child

  mouseout
     @shadow-host (target: shadow-host)
     @top (target: shadow-host)

  mouseover

Moving mouse from distributed-light-child to shadow-host

  mouseout

  mouseover

Moving mouse from shadow-host/shadow-root-child to distributed-light-child

  mouseout

  mouseover

Moving mouse from distributed-light-child to shadow-host/shadow-root-child

  mouseout

  mouseover
PASS successfullyParsed is true

TEST COMPLETE