What makes Google look for a byline mapping for a GitHub repo?

Question

When I do a Google search on some GitHub repositories, I see the row and date on the third row (at the URL). For example, the line "by D Stark - 2016" in the following screenshot. What makes this information display and what is the root source of information?

Answer 1

The author at the top is decorated with itemprop="author" , which I believe invokes this scheme http://schema.org/author .

Edit: if you copy the HTML code to https://search.google.com/structured-data/testing-tool , you can see everything that is being analyzed. Labeling HTML elements is one way to do this, another is to create special json elements that contain this data. Ref https://developers.google.com/search/docs/guides/intro-structured-data