moAlrspace13

W3C sample	WIRIS
	$x + x + x + x + x + x$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mi>x</mi>
  <mo>+</mo>
  <mi>x</mi>
  <mo lspace="0px">+</mo>
  <mi>x</mi>
  <mo rspace="0%">+</mo>
  <mi>x</mi>
  <mo lspace="2em" rspace="1em">+</mo>
  <mi>x</mi>
  <mo lspace="1cm" rspace="10px">+</mo>
  <mi>x</mi>
</math>

Author: Robert Miner and Jeff Schaefer, Geometry Technologies