story(sbb-form-field): native validation pseudo classes

[jeripeierSBB]

Feature Description

We should investigate on native pseudo class selectors, e.g. ":invalid". Should we support this in sbb-form-field and how exactly does it behave?

https://developer.mozilla.org/en-US/docs/Learn/Forms/Form_validation

References

Design Spec

Technical Spec

Definition of Done

• [ ] Documentation of finding is provided
• [ ] Investigation has been completed
• [ ] Decision on support in sbb-form-field and how exactly it does behave has been taken
• [ ] Component is implemented
• [ ] Tests are implemented
• [ ] E2E Tests are implemented
• [ ] Storybook stories are implemented
• [ ] Navigation via keyboard is tested
• [ ] Screen reader output is tested
• [ ] High-contrast is tested
• [ ] UX approved
• [ ] Remaining accessibility is tested