183641 - XUL in XHTML doesn't show up

Status: NEW

(Core :: XUL, defect)

Description

[Myk Melez [:myk] [@mykmelez]]

XUL embedded in an XHTML document doesn't appear in the document.  The DOM
inspector shows the nodes being in the document, but they don't show up.  See
the URL for a test case.

Comment 1

[Boris Zbarsky [:bzbarsky]]

This is basically "by design", as a note.  XUL stuff really does not work
outside a XUL document...

Comment 2

[Myk Melez [:myk] [@mykmelez]]

Last time I talked to hyatt (about six months ago), he said it should work. 
Note also that XUL works fine when inserted into an HTML document via XBL, f.e.:

http://www.melez.com/mozilla/xul-in-html/test5.html

Given that, I don't see why it shouldn't work when included in an XML document.

Comment 3

[Boris Zbarsky [:bzbarsky]]

> Last time I talked to hyatt (about six months ago), he said it should work. 

Nope.  The code is simply not written to do it...

> Note also that XUL works fine when inserted into an HTML document via XBL

XBL special-cases XUL.  See nsXBLContentSink::CreateElement.

Perhaps the special-casing should move to nsXMLContentSink?

Comment 4

[Benjamin Smedberg]

The XUL content sink is a big booger. We should be keeping whitespace nodes,
like we do for every other kind of XML/HTML doc. Yes, I know this involves
fixing all of our JS code which assumes there are no whitespace nodes... but it
definitely is a goal to have mixed xul/xhtml/mathml/(and SVG as possible),
without having to ship the document with an XUL mimetype.