| <html xmlns="http://www.w3.org/1999/xhtml" xmlns:math="http://www.w3.org/1998/Math/MathML"> | |
| <head> | |
| <script> | |
| function boom() | |
| { | |
| document.getElementById("mfenced").setAttribute("mathbackground", "yellow"); | |
| } | |
| </script> | |
| </head> | |
| <body onload="boom();"> | |
| <math:mfenced id="mfenced" /> | |
| </body> | |
| </html> |