Adding filters to your style
Having a map with a single symbol (that is, the same appearance for all features) is not very common. This approach is useful, and it can be used when building an index map to provide a reference showing you which part of the world is represented in the main map.
The real power of styling comes from the representation of features according to their properties, geometrical or nongeometrical. A map created to show attribute values is a thematic map. To create a thematic map, we will need to use filters to select content based on an attribute value.
In this recipe, you will build a map of countries grouped according to the continent they belong.
Tip
The full CSS style for the recipe is located in the continent.css file.
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