Github user prabhjyotsingh commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/372#issuecomment-151784808
@corneadoug idea of clear button is to clear the output, whenever the user
wants. And not necessarily for demo purposes.
Now its up to the user when (s)he wants.
Example: Re-run of notebook with code change few of the paragraphs.
Usage of too many alert/confirm boxes are bad UX.
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