Readability.TitleFinder.h_tag_title

You're seeing just the function h_tag_title, go back to Readability.TitleFinder module for more information.
Link to this function

h_tag_title(html_tree, selector \\ "h1, h2, h3")

Specs

h_tag_title(html_tree(), String.t()) :: binary()

Find title from h tag