mglyph_aspect

an mglyph doubled preserving aspect ratio.

W3C sample	WIRIS
	$$\mathrm{<mglyph\; width="2"\; height="2"\; src="nist.png"\; alt="NIST"></mglyph>}+\mathrm{<mglyph\; width="2"\; src="nist.png"\; alt="NIST"></mglyph>}+\mathrm{<mglyph\; height="2"\; src="nist.png"\; alt="NIST"></mglyph>}$$

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mi>
    <mglyph width="2" height="2" src="nist.png" alt="NIST"/>
  </mi>
  <mo>+</mo>
  <mi>
    <mglyph width="2" src="nist.png" alt="NIST"/>
  </mi>
  <mo>+</mo>
  <mi>
    <mglyph height="2" src="nist.png" alt="NIST"/>
  </mi>
</math>

Author: Bruce Miller