From what I can tell, it marks the article you're on. There are other light grey dots with other article names in it.
Yeah. This one shows a graph:
https://www.thetypicalset.com/blog/grammar-parser-maintenanc...
Solid red dots are articles you've visited.
Yeah. This one shows a graph:
https://www.thetypicalset.com/blog/grammar-parser-maintenanc...
Solid red dots are articles you've visited.