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A very interesting read from about notifications, indicators and validations. In interaction design, a system should always keep users informed, by providing appropriate feedback. Ensuring that the state of the system is always visible is one of the 10 usability heuristics for interface design. (


stacking toast notifications seem fine to me. actually toast are temporary UI elements which go away after a little delay (between 3 and 6 seconds usually). so stacking them is not a big distraction for users.


Based on your description of the content, the dismissable toast banner would be more appropriate because the user would have to click and open the slide-out panel. These panels are not typically used for validation notification messages. If the user does not need to refer to the content again, use a toast banner instead. A toast banner that is both ...

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