ChromicPDF.Template.html_concat

You're seeing just the function html_concat, go back to ChromicPDF.Template module for more information.
Link to this function

html_concat(styles, content)

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Specs

html_concat({:safe, iolist()} | iodata(), {:safe, iolist()} | iodata()) ::
  iolist()

Concatenes two HTML strings or iolists into one.

From {:safe, iolist} tuples, the :safe is dropped. This is useful to prepare data coming from a Phoenix-compiled .eex template.

content = html_concat(@styles, render("content.html"))