Heatmap - cell border

Dash Python
3

Actually scrap that it’s possible by overlaying heatmaps with different xgap, ygap and colorscales

import plotly.graph_objects as go

go.Figure(
    data=[
        go.Heatmap(
            z=[[1, 1, 1], [1, 1, 1], [1, 1, 1]],
            xgap=4,
            ygap=4,
            colorscale=["#08a", "#08a"],
            showscale=False,
        ),
        go.Heatmap(
            z=[[1, 1, 1], [1, 1, 1], [1, 1, 1]],
            xgap=20,
            ygap=20,
            colorscale=["#fff", "#fff"],
            showscale=False,
        ),
    ],
).update_layout(
    yaxis_scaleanchor="x",
    plot_bgcolor="#fff",
    width=400,
    height=400,
    margin=dict(b=0, t=20, l=0, r=20)
)

image

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