Multiple icon rendering

[MatCr90]

I can't find any documentation about the signal icons rendering order on the map.
In particular, my issue raises when there are different tags defining different signal icons on the same node (and place). Are icon overlapping or are they packed (and in which order)?
Can anyone help me understanding the final visualization on the screen and how could it be influenced?
Thanks

[hiddewie]

There is some high-level documentation how to add new features to the map in https://github.com/hiddewie/OpenRailwayMap-vector/blob/master/CONTRIBUTING.md.

Additionally, the signals YAML configuration contains a description how the features are matched on the map:

OpenRailwayMap-vector/features/signals_railway_signals.yaml

Lines 218 to 225 in 1e8f35a

	# The features below define a certain signal.
	# For every type of feature, the feature will be determined.
	# If the type is tagged on the signal (for example `railway:signal:main=QQ:blabla`) which does not match
	# one of the features below, the signal will be marked as an "unknown signal" of that type. This allows
	# viewers to view which signals exist, but are not defined yet in the features below, or mistagged in
	# the OpenStreetMap data.
	# Feature matching happens from top to bottom, where earlier matches are shown "lower" on the pole if one
	# node defines more than one signal.