Here here. Also, what possibly could be Chrome-specific here?

After looking into it a bit, I believe the only issue is that the author failed to add an r property to the SVG circles. Apparently Chrome defaults to some non-zero radius, which seems like a poorly-chosen default.

Which means the author just didn't care to try it in any other browser.

My intention wasn't to make something Chrome specific but, I did mess up by not testing in other browsers. Sorry about that.

Turns out that you can't set circle radius in CSS in both Safari and Firefox. For some reason Chrome supports it. Not sure what the correct spec is. In any case it's fixed now.

Just because you found a bug doesn't mean the author knows about it. Why not leave them a github issue instead of criticizing them here about it?

Agreed.