[berryg]

And can you copy and/or save the generated image?

[cuttysnark]

I can't seem to find an explicit save or export option apart from File > Print. Using that, the Chrome print dialog, "More Settings" allows it to be opened in Preview or "Print Using System Dialog" where it can be saved to PDF.

Alternatively, I just screen captured the rendered image with MacOs "copy selected region to clipboard" command.