I don't understand the black bars. Do they indicate a running script? | Hacker News

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Raphael on Dec 18, 2009 | parent | context | favorite | on: Codenode: write Python and Sage in your web brows...

I don't understand the black bars. Do they indicate a running script?

clemesha on Dec 18, 2009 [–]

They indicate a region where a new "Cell" can be inserted.

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