Avoid the illusion of completeness 😱
When the visible content on the screen appears to be complete but in fact more information exists outside of the viewport, giving an explicit signal for that content is crucial. Beyond doubt the design should point viewers toward that valuable information and showing some slices of what’s to come might be a good practice.
Users can think they see the entire web page, although additional content exists off-screen. Designers must help users discover all relevant information.