FWIW, there is no prop for supporting icon, it is just included in the slot for supporting text. If we do decide that 16px icons work better in this text, we could recommend that people use the size prop of the Icon component to set the size to small. Another option would be to add a new prop to the Card component called supportingIcon, but I don't know that there are other use cases for an icon at the beginning of the supporting text other than the NearbyPages example. I would recommend against adding this new prop, unless we think this is a pattern that will be used elsewhere.

In T330782#8670020, @AnneT wrote:

Another option would be to add a new prop to the Card component called supportingIcon, but I don't know that there are other use cases for an icon at the beginning of the supporting text other than the NearbyPages example. I would recommend against adding this new prop, unless we think this is a pattern that will be used elsewhere.

I agree that this is not necessary – users of the Card component already provide supporting text via a slot. In that same slot they can also include custom icon sizes or anything else that they need.

I think that it is sufficient to update our documentation to show what we consider to be the best way to use this: if a user wants to include an Icon along with Card supporting text, they should consider setting its size to small.

Based on the above feedback, I would recommend we close this task and, if desired, open a new task specific to updating the documentation.

If we learn that we need to update the component to enforce more control over the icon placement because of real-world usage, then we can re-open this.

One use case of a card with a supporting custom icon is the portrait card from Homepage where this supporting icon size is also 16px. So I think it's worth creating a supportingIcon prop once we implement the portrait in T310632. cc: @RHo

Since the supporting icon is now small size 16px, I've created this new version in the Figma exploration file to reflect the changes and also I've updated the main component in the Codex library.