For some reason, XML + CSS only seems to work properly in Opera

[Mr Initial Man]

URLS:

http://mrinitialman.furtopia.org/Stuff_Set_Aside/SVG/lattice-math-04.xml
http://mrinitialman.furtopia.org/Stuff_Set_Aside/SVG/lattice-math-05.xml
http://mrinitialman.furtopia.org/Stuff_Set_Aside/SVG/lattice-math-06.xml


CSS:
math{
font-family:"Times New Roman";
font-size:16pt;
color:black;
background:inherit;
display:block;
overflow:hidden;
}
[id='Math04'],
[id='Math05'],
[id='Math06']{
width:415px;
height:65px;
}
mn, mo, mrow{
display:inline;
padding:1px;
}
mrow[class]{
display:block;
border:1px solid black;
width:200px;
height:25px;
line-height:25px;
position:relative;
padding:3px;
margin:0;
}
mrow[class] *{
display:inline;
}
mrow[class='thousands']{
left:0;
top:0;
}
mrow[class='hundreds']{
left:207px;
top:-33px;
}
mrow[class='tens']{
left:0;
top:-34px;
}
mrow[class='ones']{
left:207px;
top:-67px;
}

mrow[class='thousands'] {background:lime;}
mrow[class='hundreds'], mn[class='SecondNum'] {background:aqua;}
mrow[class='tens'], mn[class='FirstNum'] {background:fuchsia;}
mrow[class='ones'], mn[class='Product'] {background:yellow;}

Problem: Only in Opera do I see four different equations. In Firefox, I see four instances of "X=". (Internet Explorer can't even read the thing). What did I do wrong?

[jkmyoung]

IE is unable to interpret the entity × ×
I believe MathPlayer would have to be installed for IE. http://www.dessci.com/en/products/mathplayer/

Not sure why for Firefox. You might want to try the CSS forums.