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It is on bl.ocks.org, which is managed by Mike Bostock, the founder of Observable. And there is an Observable banner on top.

• kowlo 5y ago
  Indeed, those facts didn't escape me. But like I said: nice to see some recent D3.js work that isn't on observerable.
  • throwamon 5y ago
    I really don't mean to be an ass, but since you misspelled it twice I believe you might want to know that it's spelled ObservABLE, not ObservERABLE.