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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
	  [<!ENTITY first "!"><!ENTITY fallback "&#x00e6;">]>
<html xmlns="http://www.w3.org/1999/xhtml">
<!-- U+00E6 is expected to be found in Arial and DejaVu Sans, but not
     Devanagari MT, FrankRuehl, nor Standard Symbols L.
     "!" is chosen as it is expected to be found in the first font found.  -->
      p { font-size: 16.6px;
          font-family: Devanagari MT, FrankRuehl, Standard Symbols L, Arial, DejaVu Sans; serif }
      .fallback { font-family: Arial, DejaVu Sans, serif; }
    <p><span class="fallback">&fallback;&fallback;</span>&first;<span class="fallback">&fallback;</span>&first;<span class="fallback">&fallback;</span>&first;<span class="fallback">&fallback;</span></p>