Remove Border Around Vegaembed Geoshape Generated By Altair?

In the below image, observe the border around a map generated from Chart.save() to either HTML or JSON canvas (the border is inside the canvas, not CSS styled). For any other type

Solution 1:

The way to remove the border is using configure_view(strokeWidth=0).

Here is an example, using the most recent version of Altair and the most recent version of Vega-Lite:

import altair as alt
from vega_datasets importdata

counties = alt.topo_feature(data.us_10m.url, 'counties')
source = data.unemployment.url

alt.Chart(counties).mark_geoshape().encode(
    color='rate:Q'
).transform_lookup(
    lookup='id',
    from_=alt.LookupData(source, 'id', ['rate'])
).project(
    type='albersUsa'
).configure_view(
    strokeWidth=0
)

If you see different results, it might be that your frontend renderer is out of date, and you should make certain you're using the most recent version of Vega-Lite to render your chart.