At the moment you must have Chrome 79+ with Web Bundles Enabled for these to work.
Flag: chrome://flags/#web-bundles
Useful introduction: https://web.dev/web-bundles/
Spec repo: https://github.com/WICG/webpackage
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Moby-Dick as a very simple HTML bundle, with no Javascript.
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Flatland (only part one) as very simple example of the W3C Audiobook specification as a web bundle. Once you play the first audio, it will autoplay the rest. There's also navigation between sections.
Anything fancy. Most more complex ebooks I would make require iframes, and at the moment Chrome won't load an iframe src
from a bundle. I'm assuming that will change with time.
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ebooks without reading systems
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possible accessible replacement for PDFs
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ad-hoc app distribution
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shareable web content without servers! I think in some ways this really lowers the barrier to participation on the web on your own terms. Can you imagine creating a beautiful, artful letter in HTML to send to a friend?
I'm not a real developer.