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Does not work in the calibre viewer. Does not work in Adobe Digital Editions 1.7.
When a font is missing bold/italic variants, there is no guarantee that the fallback font will be bold/italic, that's upto the vagaries of the font selection system of the OS in question. So if you want to embed a font and use its bold/italic faces, then embed all the faces.
For example, on a linux system, do
fc-match 'some family with no bold:weight=bold'
and font config will return the regular face for that font. You absolutely must not rely on rendering systems substituting a bold face for a font with no bold face of its own.
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