old_contents: """
  Image tooltip
  -------------
  This example shows how to render images in tooltips.
  Either URLs or local file paths can be used to reference
  the images.
  """
  # category: tooltip
  
  import altair as alt
  import pandas as pd
  
  source = pd.DataFrame.from_records(
      [{'a': 1, 'b': 1, 'image': 'https://altair-viz.github.io/_static/altair-logo-light.png'},
       {'a': 2, 'b': 2, 'image': 'https://avatars.githubusercontent.com/u/11796929?s=200&v=4'}]
  )
  alt.Chart(source).mark_circle(size=200).encode(
      x='a',
      y='b',
      tooltip=['image']  # Must be a list for the image to render
  )
  
new_contents: """
  Image tooltip
  -------------
  This example shows how to render images in tooltips.
  Either URLs or local file paths can be used to reference
  the images.
  """
  # category: other charts
  
  import altair as alt
  import pandas as pd
  
  source = pd.DataFrame.from_records(
      [{'a': 1, 'b': 1, 'image': 'https://altair-viz.github.io/_static/altair-logo-light.png'},
       {'a': 2, 'b': 2, 'image': 'https://avatars.githubusercontent.com/u/11796929?s=200&v=4'}]
  )
  alt.Chart(source).mark_circle(size=200).encode(
      x='a',
      y='b',
      tooltip=['image']  # Must be a list for the image to render
  )
  
subject: Correct category