Found a problem with Opera’s XML/DOM support. Seems that they don’t support appendChild() if the document is created with an "" (empty) QualifiedName.
document.implementation.createDocument("","",null);
This only seems to be a problem if you try to append to such a document. Opera 8.x (and prior?) requires you to create the document with a QualifiedName like:
document.implementation.createDocument("","foo",null);
This way appendChild will work as expected. Of course this works fine in Firefox and IE. It also apprears to be fixed in the upcoming 9.0 release of Opera.
Kevin Henrikson
Kevin has spent his career making annoying but important things work better at scale: enterprise email at Zimbra, mobile productivity (co-founded Acompli, acquired by Microsoft for $200M and became Outlook Mobile), marketplace operations at Instacart, and now healthcare administration as Co-Founder of Pretty Good AI.