title: Why can't kepler map in jupyter notebook be rendered on nbviewer
body: <p>I'm trying to figure out why my map can't be rendered on nbviewer</p>
  
  <p>e.g. <a href="https://nbviewer.jupyter.org/github/zyxue/scratch/blob/master/display-kepler.ipynb?flush_cache=true" rel="nofollow noreferrer">https://nbviewer.jupyter.org/github/zyxue/scratch/blob/master/display-kepler.ipynb?flush_cache=true</a></p>
  
  <p>I've compared the network activities between nbviewer (left) and jupyter notebook environment (right), still can't figure out why</p>
  
  <p><a href="https://i.stack.imgur.com/2OMvK.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2OMvK.jpg" alt="enter image description here"></a></p>
  
  <p>reference: <a href="https://github.com/keplergl/kepler.gl/blob/master/docs/keplergl-jupyter/user-guide.md" rel="nofollow noreferrer">https://github.com/keplergl/kepler.gl/blob/master/docs/keplergl-jupyter/user-guide.md</a></p>