title: Jupyter notebook run all cells on open
body: <p>I have a Jupyter noteboook and I'm trying to set it up in a way so that all cells are ran automatically when the notebook is opened.</p>
  <p>This behaviour is different from saved output for notebooks which contain widgets. Widgets only seem to get rendered for me when the cells containing them are run. Consider the following example:</p>
  <pre><code>from IPython.display import display
  from IPython.html.widgets import IntSlider
  
  w = IntSlider()
  display(w)
  </code></pre>
  <p>The slider is not displayed until the cell is executed.</p>
  <p>Is this something that can be accomplished through Notebook Metadata or configuration files?</p>
  <p><strong>EDIT:</strong> <a href="https://try.jupyter.org/" rel="noreferrer">https://try.jupyter.org/</a> seems to be doing something like this: Notice that the notebooks are not running when you open the page and display output when they are opened.</p>
  <p><strong>EDIT2:</strong> Adding example.</p>