Github user sarutak commented on the pull request:

    https://github.com/apache/spark/pull/5947#issuecomment-99681140
  
    @andrewor14 Thanks for letting me know another issue. I found the reason is 
`vis.js` (not vis.min.js) is absent. `vis.js` is designated in `vis.map` which 
is a file for Source Maps.
    
    Source Maps is used for symbol resolution for abbreviated symbols in 
*.min.js (http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/).
    
    `vis.map` and `vis.js` are only downloaded when we use debug tools embedded 
in browsers.



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