The font for this test case, contributed by Simon Cozens, contains glyphs outlines in both CFF and glyf format. Because the Offset Table uses an sfntVersion of 0x4F54544F (‘OTTO’), your rendering engine should take the glyph outlines from the CFF table. If you see CFF below the characters A and B, your rendering engine makes correct use of the sfntVersion field. See also fontkit bug 214 and OpenType.js bug 419.