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 prop

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.