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On Calibre, convert to epub and select epub3 in epub Output settings
But I've never found any need for epub3 with ordinary novels.
I've never seen <wbr /> A long URL can have short display text, though I prefer the visual text to match the URL. I've also started using QR codes with same URL underneath as my phone works with them on paper, OLED, LCD, eInk in real books, phones, tablets, monitors and eink. I set height to 80px and width to auto for small graphics and width to a suitable % and height to auto for large graphics.
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