title: Python plotly write_html: Integrate graph into a new page with additional content
body: <p><br>
  I would like to integrate a plotly graph into a html page. This is working so far, as I can create a page with <code>write_html</code> and create a new html file, that only includes the graph. <br>
  Further I try to integrate that graph into another html page to make it part of a page, so I added it with <code>&lt;script src="example_plot.html"&gt;&lt;/script&gt;</code> into an existing html file with more text, but it always goes full page when I open the new page. I tried to change the autosizing, width, height etc., nothing worked.<br>
  I am grateful for every help, thanks a lot in advance. Cheers!</p>
  
  <p>creating plotly graph and html page:</p>
  
  <pre><code>import plotly.graph_objects as go
  import numpy as np
  
  x = np.arange(10)
  
  fig = go.Figure(data=go.Scatter(x=x, y=x**2))
  
  fig.write_html('example_graph.html')
  </code></pre>
  
  <p>embedding plotly graph into another html page: unfortunately always full screen and not part of page, additional content is not shown:
  <div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
  &lt;html lang="en"&gt;
  &lt;head&gt;
      &lt;meta charset="UTF-8"&gt;
      &lt;title&gt;Plotly and fun &lt;/title&gt;
  &lt;/head&gt;
  
  &lt;h1&gt;Title and some content above plotly graph&lt;/h1&gt;
  
  &lt;div src="example_graph.html"&gt;&lt;/div&gt;
  
  &lt;p&gt;Other stuff below the plot&lt;/p&gt;
  &lt;body&gt;
  
  &lt;/body&gt;
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>