Tree left

node 1
normal content
node 2
subnode 2.1
other content
subnode 2.2 closed
subnode 2.2.1
subnode 2.2.2
node 3 closed
still some content here

Tree right

node 1
normal content
node 2
subnode 2.1
other content
subnode 2.2 closed
subnode 2.2.1
subnode 2.2.2
node 3 closed
still some content here
In this example, tree navigators use the option tabIndex:-1 and therefore do not get keyboard focus; so they have to register keyboard handlers directly on document ... and therefore navigation is simultaneous on both trees!