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0001 The Ahem font was developed by Todd Fahrner to help test writers
0002 develop predictable tests. The font's em square is exactly square.
0003 Its ascent and descent is exactly the size of the em square. This
0004 means that the font's extent is exactly the same as its line-height,
0005 meaning that it can be exactly aligned with padding, borders, margins,
0006 and so forth.
0007 
0008 The font's alphabetic baseline is 0.2em above its bottom, and 0.8em
0009 below its top. The font has an x-height of 0.8em.
0010 
0011 The font has four main glyphs:
0012 
0013   'X' U+0058 A square exactly 1em in height and width.
0014 
0015   'p' U+0070 A rectangle exactly 0.2em high, 1em wide, and aligned so
0016              that its top is flush with the baseline.
0017 
0018   'É' U+00C9 A rectangle exactly 0.8em high, 1em wide, and aligned so
0019              that its bottom is flush with the baseline.
0020 
0021   ' ' U+0020 A transparent space exactly 1em high and wide.
0022 
0023 Most other US-ASCII characters in the font have the same glyph as X.
0024 
0025 Additionally, the following Unicode formatting characters are assigned
0026 appropriate glyphs so that they may safely be used in tests as well:
0027 
0028   U+2002 - en-space
0029   U+2003 - em-space
0030   U+2004 - 3-per-em space
0031   U+2005 - 4-per-em space
0032   U+2006 - six-per-em space
0033   U+2009 - thin space
0034   U+200A - hair space
0035   U+200B - zero-width space
0036   U+200C - zero-width non-joiner
0037   U+200D - zero-width joiner
0038   U+3000 - ideographic space
0039   U+FEFF - zero-width non-breaking space
0040 
0041 The Ahem font belongs to the public domain as described in COPYING.
0042 
0043 Acknowledgements:
0044   v1 The font was originally created by Todd Fahrner in the late 90s.
0045   v2 It was updated by Paul Nelson in the mid 2000s to add x-height
0046      information to the OS/2 table and to add the space and non-breaking
0047      space glyphs.
0048   v3 It was further updated by Sergey Malkin to include the non-ASCII
0049      space glyphs.