This section is missing an entire writeup on the eBook/EPUB problem with scripting in books - which is also related to confusion around origins in web views. In these case, the apps (readers) aren't using the same technologies mentioned here, but are usually native apps with embedded platform web views - though all the underlying issues apply
_Originally posted by @lrosenthol in https://github.com/WebView-CG/usage-and-challenges/pull/25#discussion_r925559440_