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http://lists.w3.org/Archives/Public/www-svg/2007May/0014.html
CSS says the following about selecting "missing glyphs": The UA should map each character for which it has no suitable font to a visible symbol chosen by the UA, preferably a "missing character" glyph from one of the font faces available to the UA. So in practice, it shouldn't make a difference whether we said that the first or last <missing-glyph> is used.