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File:  Presentation/GeneralLayout/mphantom/mphantomBoperators3.xml (mml file)  
Author:  Robert Miner and Jeff Schaefer, Geometry Technologies  
Description:  This example tests to make sure that an <mphantom> really acts like an invisible <mrow>. In particular, it should not mask the fact that its content is an operator, and screw up the operator spacing around it.  
Sample Rendering: 

Your browser's rendering:
$A+A\phantom{+}A$
Source Code:
<math> <mrow> <mi>A</mi> <mo>+</mo> <mi>A</mi> <mphantom> <mo>+</mo> </mphantom> <mi>A</mi> </mrow> </math>