Your latest attribute API changes have affected the display of XML documents. We're hitting an assert when trying to display books.xml, which is part of the developer demo. You probably don't have that, so here's some simple XML that causes an assert. <?xml-stylesheet type="text/css" href="bach.css"?> <ARTICLE xmlns:html="http://www.w3.org/TR/REC-HTML40"> <HEADLINE>Fredrick the Great meets Bach</HEADLINE> <AUTHOR>Johann Nikolaus Forkel</AUTHOR> <PARA> One evening, just as he was getting his <INSTRUMENT>flute</INSTRUMENT> ready and his <html:img SRC="house.gif"/>musicians were assembled, an officer brought him a list of the strangers who had arrived. </PARA> </ARTICLE> ---- begin bach.css --- XML { background-color: white} INSTRUMENT { display: inline } ARTICLE, HEADLINE, AUTHOR, PARA { display: block } ---- end bach.css ---- Here's the stack trace NTDLL! 77f76148() nsDebug::Assertion(const char * 0x00688220, const char * 0x006881f8, const char * 0x006881c8, int 1830) line 95 + 13 bytes nsGenericContainerElement::SetAttribute(int -1, nsIAtom * 0x00f0fe00 {"html"}, const nsString & {"http://www.w3.org/TR/REC-html40"}, int 0) line 1830 + 32 bytes nsXMLElement::SetAttribute(nsXMLElement * const 0x00fa761c, int -1, nsIAtom * 0x00f0fe00 {"html"}, const nsString & {"http://www.w3.org/TR/REC-html40"}, int 0) line 200 nsXMLContentSink::AddAttributes(const nsIParserNode & {...}, nsIContent * 0x00fa761c, int 0) line 438 nsXMLContentSink::OpenContainer(nsXMLContentSink * const 0x00f10680, const nsIParserNode & {...}) line 586 + 20 bytes CWellFormedDTD::HandleToken(CWellFormedDTD * const 0x00f826c0, CToken * 0x00f80360, nsIParser * 0x00f161b0) line 811 + 22 bytes nsParser::BuildModel() line 765 + 20 bytes nsParser::ResumeParse() line 723 + 11 bytes nsParser::EnableParser(int 1) line 596 nsXMLContentSink::ResumeParsing(nsXMLContentSink * const 0x00f10680) line 1208 nsDoneLoadingStyle(nsIUnicharStreamLoader * 0x00f833f0, nsString & {" BookSet { display: block; } Book { float: left; display: block; width: 300px; margin-bottom: "}, void * 0x00f78230, unsigned int 0) line 848 nsUnicharStreamLoader::OnStopBinding(nsUnicharStreamLoader * const 0x00f833f4, nsIURL * 0x00f16980, unsigned int 0, const unsigned short * 0x00fa68a0) line 148 + 31 bytes OnStopBindingProxyEvent::HandleEvent(OnStopBindingProxyEvent * const 0x00fa7100) line 575 StreamListenerProxyEvent::HandlePLEvent(PLEvent * 0x00fa7104) line 453 + 12 bytes PL_HandleEvent(PLEvent * 0x00fa7104) line 395 + 10 bytes PL_ProcessPendingEvents(PLEventQueue * 0x00eb9810) line 357 + 9 bytes _md_EventReceiverProc(HWND__ * 0x00020256, unsigned int 49382, unsigned int 0, long 15439888) line 675 + 9 bytes USER32! 77e71250() 00eb9810()

Eeek. Needed to support the 'xmlns' pseudo namespace.

Christopher can you please verify using the supplied sample code

Verified fixed using both books.xml and the sample code provided here. Feb-03-99 build, NT 4 SP 4.