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This page features links to a previous and a next page. The HTML for these two links has an additional data-vtbag-link-types attribute:

<a href="/viewer-demo/3/" data-vtbag-link-types="next/prev">Prev</a>
<a href="." data-vtbag-link-types="same">Same</a>
<a href="/viewer-demo/2/" data-vtbag-link-types="prev/next">Next</a>

The identifiers after the slash (/) are set as view transition types on forward navigation. The identifiers before the slash are used as view transition types for history back traversals. You might even specify three values a/b/c for backward, same, and forward directions. Or a single value, which will then be used for all directions.