OK, if we're down to this type of optim, still works on chromium: -> xlink namespace is ignored -> in css: "circle.n" -> ".n" -> 1000 -> 1e3 -> I won two more bytes by translating "translate(480,480)scale(.04)" into "matrix(.04,0,0,.04,480,480)" (you can count...

by the way, v1nce's solution can further be improved that way to 804bytes: <svg width="1000" height="1000" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1"><style>circle{stroke:#ddd;fill:none}circle.n{fill:#...

I gave it a try in 1946 bytes (entirely done in inkscape, saved as optimized svg), then hand-removed some useless stuff to 1556 bytes <?xml version="1.0" encoding="UTF-8" standalone="no"?> <svg xmlns="http://www.w3.org/2000/svg" height="105.45mm" wid...