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Might also be using the native Context Index API.[0] That's usually used to allow sites to be downloaded and browsed offline. I think that's how SVGOMG does it too

[0] https://developer.mozilla.org/en-US/docs/Web/API/Content_Ind...



The Content Index API only tells the browser that a page is available offline, you still have to cache it with a serviceworker.


Good tip, thanks




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