Example. This page pretends to be Example Guidebook, Version 1.0 (sample data, not a real title) so you can see the open-time check. Change the version with ?v=1.1 or ?v=1.2.

Example Guidebook

When a digital edition opens, it quietly asks Open Adaptive Editions whether a newer version exists. If you are offline, or the check is slow, nothing happens and you keep reading. If there is an update, a small banner explains what is new.

The one line a digital edition adds

<script src="https://open-adaptive-editions.vercel.app/oae-check.js"
        data-title="example-guidebook" data-version="v1-0" defer></script>

Answer from the check

Waiting for the page to finish loading...