How to change opacity or fill type of a single Mark on a Stacked Bar Chart

Hi folks, I am using StackedBarChart to plot categorical data, using the tableau10 color scheme. I want to shade one particular Mark differently - such as change its color, or change its fill type - e.g. to use line shading rather than color shading.

Is this possible and if so how might I approach it?

Thank you in advance for any assistance.

Hello! I assume you’re using Observable Plot? In that case the answer might simply be to use the stroke channel instead of fill to indicate the color.

Please open a GitHub discussion for further questions — we’re trying to move the conversations about Plot to a central place. (We similarly have discussion boards for D3 and Framework.)