Browser support: baseline

[gfellerph]

Should we define standards in how we deal with web platform features that are described by baseline?

Suggestion:

• Baseline: widely available. This means the feature can be safely used without fallback
• Baseline: newly available. This means the feature can be used but a fallback needs to be provided. Optionally, a ticket can be created to remove the fallback, once the feature enters "wide availability".

Example: Focus styles (https://github.com/swisspost/design-system/blob/main/packages/styles/src/mixins/_utilities.scss#L115) has a fallback for cases where :focus-visible is not supported. However, this feature has a baseline: widely available. The mixin is used in a lot of components and removing the fallback could simplify the code.

[oliverschuerch]

@gfellerph This should be discussed in the next monthly.