With substitution of otf versions of the original embedded ttf fonts, I'm not having the problem of slanting in Sigil 0.7.1 "Book View".
Now that I have properly working fonts Sigil displays small caps where they're called for. Calibre ebook viewer will display the small caps, but it sometimes when small caps are only indicated for the first line of the first paragraph in a chapter, it uses them for the remainder of the paragraph and subsequent paragraphs. ADE 1.72 and 1.8 use the Roman font lowercase for small cap lowercase. Nook Desktop Reader uses its default font to render small caps as smallcaps, and Sony Desktop Reader does the same.
The odd thing is that when I embed a ttf small cap font with all the other embedded fonts being otf, Nook, Sony and ADE 1.7 & 2.0 use a default font instead of the embedded fonts for all of the text. If the small cap font is also an otf version, then all the embedded fonts are used where they're called for including the small caps.
Although I've not seen any differences in the display of epubs I've looked at with ADE 1.7 and 2.0, I do see that according to reports in this thread on font embedding, some embedded fonts fail to be displayed with ADE 1.72.
Quote:
https://www.mobileread.com/forums/sho...d.php?t=148412
ADE 1.7.2 is using RMSDK 9.1, ADE 1.8 and most of the Nook devices (but not the original) are using RMSDK 9.2 and above. Font rendering was changed drastically between 9.1 and 9.2 (its using a completely separate engine). So it would seem to make sense that this is failing on 9.1 but not on 9.2. You can force RMSDK 9.2 to use the old engine by adding in 'adobe-text-layout: optimizeSpeed;' which may help you with troubleshooting.
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So do some readers still use ADE 1.72?
Epub reader for FireFox may display using embedded fonts at first, but renders with default font when scrolling back or forwards across chapters. I have read somewhere that FF epub reader won't display using embedded fonts unless thay are installed on the system, but this doesn't seem to be the case as I've tried viewing it on a PC where the embedded fonts are installed on the system and on one where they aren't installed and I see no difference in the behavior on the two different PCs.