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Starts a local server and prints its URL. The page plays the document, scrubs, and has an export panel that renders on the GPU in the browser tab. See Previewing and review for the controls. The server prints its process id on startup and holds its port until stopped with ctrl-c or kill <pid>. It stops itself after ten minutes with no browser attached.
Requires a sign in. Accepts a .json document; assets and fonts resolve relative to it.