title: Plotly: treemap element with "href" not working
body: <p>I have simple table whin <code>href</code> link inside the text. But clicking on it doesn't open the page.
  is there any easy way to do that?</p>
  <pre><code>import plotly.express as px
  df = px.data.gapminder().query(&quot;year == 2007&quot;)
  
  link_ref = '&lt;a xlink:href=&quot;http://google.com&quot; style=&quot;cursor: pointer&quot; target=&quot;_blank&quot; rel=&quot;noopener noreferrer&quot;&gt;{}&lt;/a&gt;'
  df['country'] = df['country'].apply(lambda item: link_ref.format(item, &quot;{}&quot;))
  
  fig = px.treemap(df, path=[ 'continent', 'country'], values='pop',
                    color='lifeExp', hover_data=['iso_alpha'])
  fig.show()
  </code></pre>
  <p><a href="https://i.stack.imgur.com/doJjw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/doJjw.png" alt="" /></a></p>