<html xmlns="http://www.w3.org/1999/xhtml"> <body onload="document.getElementById('table').setAttribute('rowlines', 'dashed')"> <div><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> <mfenced open="[" close="]"> <mtable id="table"> <mtr> <mtd><mi>x</mi></mtd> <mtd><mi>y</mi></mtd> </mtr> <mtr> <mtd><mi>z</mi></mtd> <mtd><mi>w</mi></mtd> </mtr> </mtable> </mfenced> </math></div> </body> </html>