Messaging components are essential in user - interface interactions since they are the answer of the interface to the user. They thus guarantee that there is an actual interaction by informing users of successful or pending actions, or of specific contexts so they are not frustrated to ignore what is wrong.
You can find the below components in
Flash messages inform users of successful or pending actions. A specific background color helps to convey their meaning. To not confuse the users, don't show more than one message at a time.
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Availability message is a specific message that informs the users that a product is not available at the time or in their country. They are usually inserted below the name of the product, so it is one of the first informations that the users can read.