They're the titles of the author's blog posts: https://ronanberder.com/ https://ronanberder.com/ (see bottom of page) - i.e. it's a screenshot of them using it

They're the titles of the author's blog posts: https://ronanberder.com/ https://ronanberder.com/ (see bottom of page) - i.e. it's a screenshot of them using it for their own blog.