Add a property to Block that aligns with the Notice and Input status states.
Use the icon property/slot to show appropriate icons for states.
Block and BlockSection
An input or something inside a Block is in an error or warning state...it needs attention otherwise the workflow is obstructed. The thing needing attention is inside a Block that is collapsed and there's not clear way to route the user to the error.
These design show something like status="danger".
Would also have "warning".
I'm not sure if we need "success", but it wouldn't hurt.
I don't think we need "info".
Also, this could also just be status="invalid" to be more like Label and Input, but having "warning" and "success" might be nice. I'm open to suggestions on that.
Collapsed.
I'm not sure how I feel about the border, but it matches Alert.

Expanded
This shows error states for Block section.
Note: the input error state is not part of this issue.

Possibly a v2.
Might be nice if Block could inspect its contents for Calcite Components that are in invalid/danger/warning states and bubble that status up to the header. Based on that, it could update its status to the most severe status.
Could use this in time for 9.3.
cc @CodeBarker
@asangma suggest making the red line 2px to be cohesive with notice and alert
Updated UI.

Note: I don't foresee the "valid" status being used much. It is there to have parody with Input.
the red line 2px to be cohesive with notice and alert
Hmmm...I had the impression we were nixing the border.
YEAH kill it. that comment was from last night
@caripizza Would you mind assigning this one to someone to verify? :)
@asangma yep I'll verify it
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See demos/shell/block-configurations.html
Verified the new UI and behavior on master: now block and block-section can each have their own unique status properties. And when status is set to valid or invalid, the elements render with a status icon which matches the valid/invalid input-message status icons.