CSS: node style map unexpected content

Look at the test case attached.
Launch it, and click on the "Get styles" button, that display the content of the map attached to the button :
- alignment (set in caspian) have been overridden by an API call, is it expected that it is still in the map ?
- if yes, why text-fill (which has also been set in caspian, and overridden by an API call) is NOT in the map ?
- why opacity (not set in caspian) is in the map ?