Meeseeks.Context.add_to_matches

You're seeing just the function add_to_matches, go back to Meeseeks.Context module for more information.
Link to this function

add_to_matches(context, selector, node)

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Specs

add_to_matches(t(), Meeseeks.Selector.t(), Meeseeks.Document.node_t()) :: t()

Adds a node to a list in the context's matches map corresponding to the selector that the node matched.