Floki.parse_fragment

You're seeing just the function parse_fragment, go back to Floki module for more information.
Link to this function

parse_fragment(fragment, opts \\ [])

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Specs

parse_fragment(binary(), Keyword.t()) ::
  {:ok, html_tree()} | {:error, String.t()}

Parses a HTML fragment from a string.

It will use the available parser from application env or the one from the :html_parser option.

Check https://github.com/philss/floki#alternative-html-parsers for more details.