Quote:
WOFF (and WOFF2) was invented long after EPUB3 came out. No older devices can support it.
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WOFF has been around for quite a while but if not supported in devices it doesn't matter since the only reason to use it on the web is quicker loading of embedded fonts to avoid the flash of unstyled content. Doesn't matter to make a slightly smaller EPUB.
OTF is fine for me now I know that WOFF is poorly supported. I simply assumed ereaders were better than they are after all these years, which I won't do again. But certainly readers like BibiReader and even Sigil itself support WOFF, which led me astray.