Hallvord R. M. Steen wrote:
Spec says about responseXML :
If the document was not an XML document, or if the document could
not be parsed (due to an XML well-formedness error or unsupported
character encoding, for instance), returns null.
All major browsers return an empty document instead under most of
these conditions.
Gecko doesn't ever return an empty document from XMLHttpRequest. Sometimes it
returns a bogus document with some "parseerror" markup in it due to
<https://bugzilla.mozilla.org/show_bug.cgi?id=289714>; that's a bug that needs
to be fixed. But the document is never going to be completely empty; see
http://bonsai.mozilla.org/cvsblame.cgi?file=mozilla/extensions/xmlextras/base/src/nsXMLHttpRequest.cpp&rev=1.147&mark=1431-1433#1425
- FireFox *does* return null if the document is sent as text/html
Or anything else that doesn't look like an XML MIME type. Or if a network error
occurs. Or if the user cancels the load. An so forth.
-Boris
