<html xmlns="http://www.w3.org/1999/xhtml"> <head> <style> /* use attribute selector instead of the .class shorthand to work around bug 379178 */ *[class="fixed"] { position: fixed; } math, mtable, mtr { position: inherit; } </style> </head> <body> <div class="fixed"> <math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> <mtable> <mtr class="fixed"> <mtd><mi>x</mi></mtd> </mtr> <mtr> <mtd><mi>y</mi></mtd> </mtr> </mtable> </math> </div> </body> </html>