STATUS INDICATORS - Guidance on when to use filled vs outline icons

[KennyAtHPE]

Who is requesting this? (add contact details here)
Original question from Aideen

What is the problem this ask is trying to solve?
We do not have guidance on when to use Filled vs Outline status icons. It isn't very clear for users as to when to use one or the other. Additionally, are there accessibility considerations we should be taking into consideration as to which icon should be used at which sizes? There have been discussions in the past that outline icons might hurt readability at medium and below sizes.

Current use cases

Filled

• Notifications
• DataTables

Outline

• Empty state
• Form validation

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Reviewers:

• Reviewer 1

• Reviewer 2

List possible consequences, involved assets and components:
1.

Define MVP for this ticket (format, amount of detail, where it should live, etc):

Follow up tickets: (if necessary)
1.

Checklist (add your progress in the comments)

• Define the Problem (build a small presentation about the problem)
• Ideate (present at least two option with pros and cons)
• Build
• Gather feedback
• Create a PR or new file
• Ask for review
• Publish
• Communicate