Formatting of right hand side of equation should be identical to formatting of left hand side
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> <msubsup> <mi>T</mi> <mi>m</mi> <mi>n</mi> </msubsup> <mo>=</mo> <mover> <mrow> <msubsup> <mi>T</mi> <mi>m</mi> <mi>n</mi> </msubsup> </mrow> <mphantom> <mtext>x</mtext> </mphantom> </mover> </math>
Author: George Chavchanidze, Opera Software ASA