I've attached an epub which demonstrates this. The first page declares all 4 faces of Libertine, the 2nd page only declares the normal "regular" face.
Sigil [& Calibre] shows no formatting at all on the first page, while ADE on my Nook shows it correctly.
However, Sigil [& Calibre] shows the 2nd page correctly but my Nook does not.
Even more interesting is that Sigil does not appear to be "faking" the formatting. The st ligature glyph of the Libertine font is fairly unique in its italic form. Is something in Sigil/webkit intelligently searching for & finding the correct font files?
Troy
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