Title: Theory / Unimportant / CS / Descriptive / Material / Component / Banner

Name: Banner
Definition: displays an important, succinct message
Page: https://material.io/components/backdrop#behavior
Context: Material
Definition2: Requires an action to be dismissed
Definition3: Can be ignored, do not block user's current action
Intuition: Prominent, medium priority
Cardinal: At most one at a given time

Question: Constraint on a banner's button
Answer: They must be related to the banner's content
Page: https://material.io/components/backdrop#behavior
Context: Material
Answer2: At least two buttons. If the user had no choice, then snackbar or warning would be more appropriate
Answer3: All buttons on a single line, unless very small screen

Question: Constraint on a scrolling when a banner is present
Answer: Banner should never disappear, so scrolling is limited
Page: https://material.io/components/backdrop#behavior
Context: Material
Answer2: The banner may scroll with the content, e.g. if the surface move.
It may also remain fix on top of screen