This test verifies that partial rendering correctly observes the current scale (the text size should not change); it verifies that the scale and index properties are set inside event handlers (on mouseover, the text labels should read "1 / 1" etc.); it verifies that partial rendering wires up the scene of preceding siblings, so as to allow property chaining (no crashes); lastly it verifies that when a panel triggers an event, its children have a scene attribute set, but no index.