Altair might ignore a property that you specified. In the chart below, we are using a
text channel, which is only compatible with
mark_text. You do not see an error or a warning about this in the notebook. However, the underlying Vega-Lite library will show a warning in the browser console. Press <kbd>Alt</kbd>+<kbd>Cmd</kbd>+<kbd>I</kbd> on Mac or <kbd>Alt</kbd>+<kbd>Ctrl</kbd>+<kbd>I</kbd> on Windows and Linux to open the developer tools and click on the
Console tab. When you run the example in the cell below, you will see a the following warning.