<html xmlns="http://www.w3.org/1999/xhtml" xmlns:html="http://www.w3.org/1999/xhtml"> <head> <style> [class="capleft"] { caption-side: left; } [class="collapse"] { visibility: collapse; } </style> </head> <body> <div> <math xmlns="http://www.w3.org/1998/Math/MathML" display="block" class="collapse"> <mtable> <mtr> <mtd><mi>x</mi></mtd> <mtd><mi>y</mi></mtd> </mtr> <html:caption class="capleft"> <mtd><mi>z</mi></mtd> <mtd><mi>w</mi></mtd> </html:caption> </mtable> </math> </div> </body> </html>