1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <style type="text/css"> #q:after { content: 'A'; } </style> </head> <body> <mrow xmlns="http://www.w3.org/1998/Math/MathML"></mrow> <span id="q"><span><div></div></span></span> </body> </html>