1 <html xmlns=
"http://www.w3.org/1999/xhtml"
2 xmlns:
math=
"http://www.w3.org/1998/Math/MathML">
4 <body onload=
"boom();">
9 document
.getElementById("merror").appendChild(document
.getElementById("s"));
13 <math:merror id=
"merror"></math:merror>