The focus is on a thin piece of carbon fibre that connects the uppermost flap to the nosecone.
While it is detail-driven by a cute reading of the rulebook, it has not sparked some kind of legal furore among rival teams - as has been suggested - before the FIA finally declared it legal.
The thin connecting piece is fully compliant with the relevant Article 3.9.1 section e) of the technical regulations, which reads: "With the exception of the rearmost closed section, the rearmost point of every closed section must not be visible when viewed from above".
In essence, this declares that only the uppermost section of the front wing may have its rear edge visible. The lower tiers must be hidden by the overlaps from the sections above.
For example, the rear edge of the second element is concealed by the third element above.
Mercedes, to remain compliant, has used this thin strip of carbon fibre that connects the main body of the fourth and final element to the nosecone to conceal the rear edge of the third rung.
Autosport understands that the FIA was immediately satisfied that this interpretation was fully compliant and that Mercedes had been in contact with the governing body throughout the front wing's gestation, contrary to reports the governing body has only belatedly declared it legal.
"What's being put on a car is always following a, let's say, exchange with the FIA all through the process," clarified Mercedes motorsport boss Toto Wolff.
"It's no such thing that you have a clever idea, and then you bolt it on the test, and you think that could be or couldn't be challenged. That is a long process of dialogue that happens over the winter.
Source: Autosport