This is from the Help file:
About Supersites
Modern web browsers support many advanced HTML5 and CSS3 effects, allowing much more dynamic and visually exciting websites to be created.
Supersites use these effects to allow you to add dynamic animated page transitions and display options to your webpages as a user clicks through the navigation on your website.
Supersite animations are hardware accelerated, which is supported by almost all modern browsers, including those on phones and tablets, to ensure a fast and smooth animation.
Whilst Supersites are not appropriate for large or complex websites, they are especially suitable for smaller sites, or for web documents, presentations and anywhere where a slideshow style of content might be called for. Presentations are always published as supersites.
Vertical or horizontal display options allow the viewer to scroll through the pages using a mouse, or else swipe through pages when using a tablet or other mobile device. The pages are presented as a single scrolling list. Alternatively a selection of Page Transitions offer a large range of transitions to choose from.
If you look under "Supersites" in the Help file, there is more on this. For instance, Supersites as an alternative to .pdfs.
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