The Tor Browser / file revision

 Notes about fonts in this directory

 Ahem.ttf - ACID3 test font

 markXXX.ttf and markXXX.otf

 These fonts are autogenerated with FontForge using the Python script mark-generate.py.  

 See the comments in that file for more information on how to run the script.

 The markX.ttf and markX.otf fonts contain a single glyph for the X character consisting

 of three stacked boxes.  The mark2X.ttf and mark2X.otf files also contain just a glyph for the

 character X but the glyph is similar to the space mark character.  The markXmark2Y.ttf has

 two glyphs, the first glyph for X and the second glyph for Y.

 The markA.eot and markB.eot files are for EOT-related testing.  The markA.eot file is just 

 a copy of markA.ttf while markB.eot is a valid EOT file embedding the contents of markB.ttf

 with a null root string (so it can be used in IE without domain-specific restrictions).

 PositioningTest1.ttf, PositioningTest2.ttf

 These fonts were generated with FontForge and then OpenType tables added with MS VOLT.

 The glyphs are from Charis SIL (see http://scripts.sil.org/CharisSILFont), released under the

 Open Font License.

 In both fonts, the lowercase 'o' glyph should appear raised when rendered. Font 1 uses a GPOS

 positioning rule to achieve this, so it tests whether vertical deltas are being handled

 correctly. Font 2 uses a GSUB substitution to replace the 'o' with a glyph that has already

 been offset within the em-square, so no vertical delta is involved.

 Finally, the capital 'O' character maps directly to the shifted 'o' glyph, so this can be

 used for comparison without requiring any OpenType layout support.