title: Altair Chart in Python: how to remove the counpound chart border for the 'HConcatChart'
body: <pre><code>import altair as alt
  from vega_datasets import data
  
  iris = data.iris.url
  
  chart1 = alt.Chart(iris).mark_point().encode(
      x='petalLength:Q',
      y='petalWidth:Q',
      color='species:N'
  ).properties(
      height=300,
      width=300
  )
  
  chart2 = alt.Chart(iris).mark_bar().encode(
      x='count()',
      y=alt.Y('petalWidth:Q', bin=alt.Bin(maxbins=30)),
      color='species:N'
  ).properties(
      height=300,
      width=100
  )
  
  alt.hconcat(chart1, chart2).ViewConfig(strokeWidth = 0)
  </code></pre>
  
  <p>Is there any way to make the border of these two horizontal charts disabled? The .config_view is not available for compound charts.</p>
  
  <p>Thanks.</p>