The <strong> or <em> properties are declared in epub html code. An epub reader like Moon+ should interpret it and find the proper font to display it (rather than make fake bold and fake italic, or, slanted font). For example, if I put SegoeUI, SegoeUIBold and SegoeUIitalic.ttf in the same folder, Moon+ should use them all to display something like:
Quote:
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This is a true italic font.
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What's more, I hope that Moon+ will support advanced Opentype features like smallcaps and contextual ligatures, which are all the work done by font designers to make better reading experience.
And if not,
which e-book app is the best to support fonts and font features?