Automatically play audio from one chapter to the next

[marisademeglio]

When one HTML page's audio narration ends, the next page in the sequence is automatically loaded. But the audio doesn't keep playing automatically due to browsers' autoplay policies.

I would like the browser to ask the user to grant permission for autoplay across all the documents in the book, something like:

Browser: Grant media autoplay for https://BookProvider.com/BookTitle/* ?
User: Yes please thank you

The result would be that all pages at that address can now automatically play media.

TODOs for the time being:

• research autoplay policies more thoroughly.
• experiment with workarounds such as prompting the user to interact with the page if autoplayback failed.
• see the autoplay detection work at W3C, and specifically, this issue about asking for autoplay permission, which looks like it matches our use case here.

[marisademeglio]

noting this here to read later w3c/autoplay#13 (comment)

[marisademeglio]

This should be something to be configured on the server via a permissions policy but in practice, it doesn't work in browsers. However, there is a user-controllable setting that can enable autoplay, and that works. See some experiments I did.

[marisademeglio]

Should be fixed by
441da2d