Add EPUB file type support to Web Share API aka navigator.share()

[evangow]

The navigator.share() doesn't currently support EPUB files, but readers want to be able to share EPUBs downloaded in the browser directly to their preferred reading app.

EPUB support in navigator.share() would be incredibly valuable to readers.

Related Docs: https://developer.mozilla.org/en-US/docs/Web/API/Navigator/share

[Jon]

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