It seems the calibre viewer ignores the CSS property font-size if the value is expressed in absolute units. I tried "px", "pt" and "cm" and the text remained the same size of a 1em control text. Inches ("in") seem to work correctly. Relative units (I tried "px" and "ex") work as intended. The book was a normal EPUB2 e-book.
An important detail is that the book preview in the e-book Editor works correctly with all units, the problem is limited to the Viewer. Maybe the bug is due to the "new" Viewer from calibre 4.0?
It seems the calibre viewer ignores the CSS property font-size if the value is expressed in absolute units. I tried "px", "pt" and "cm" and the text remained the same size of a 1em control text. Inches ("in") seem to work correctly. Relative units (I tried "px" and "ex") work as intended. The book was a normal EPUB2 e-book.
An important detail is that the book preview in the e-book Editor works correctly with all units, the problem is limited to the Viewer. Maybe the bug is due to the "new" Viewer from calibre 4.0?