266685 - XTFVisual using div's are not laid out properly

Status: RESOLVED WORKSFORME

(SeaMonkey :: General, defect)

Description

[Allan Beaufour]

I create an XTFVisual element, that uses a XHTML DIV tag as VisualContent and
InsertionPoint. I then have two of these right after each other. The first get
shown correctly, but the following is rendered badly in the far right side of
the browser window.

Comment 1

[Allan Beaufour]

Attachment: Example file

Here is an example using the <group> element from
https://bugzilla.mozilla.org/show_bug.cgi?id=265216

If you enter some text inbetween the two <xforms:group> tags, both are rendered
correctly.

Comment 2

[Olli Pettay [:smaug][[e-mail]]]

You want to create a block type box, but by default boxes are inline.
So XTF creates an inline box which then has a block box (the div element) as a 
child. Apparently something goes wrong there. XTF code doesn't handle properly 
block-inside-inline cases. 

One way to fix this problem (temporarily) is to set the box type of the group:
@namespace xf url("http://www.w3.org/2002/xforms");
xf|group {
  display: block;
}

Comment 3

[Allan Beaufour]

We can fix it permanently by installing our own stylesheet, using the approach
in bug 179006.

Comment 4

[Allan Beaufour]

*** Bug 277440 has been marked as a duplicate of this bug. ***

Comment 5

[Darin Fisher]

> So XTF creates an inline box which then has a block box (the div element) as 
> a child. Apparently something goes wrong there. XTF code doesn't handle 
> properly block-inside-inline cases. 

I believe that block-inside-inline is not permitted by HTML, so are you sure
this is really XTF specific?  perhaps the XTF API should give the implementor
the ability to specify block vs. inline.

From section 7.5.3 of the HTML 4.01 specification:

  Generally, block-level elements may contain inline elements and other 
  block-level elements. Generally, inline elements may contain only data and 
  other inline elements.

Comment 6

[Boris Zbarsky [:bzbarsky]]

> I believe that block-inside-inline is not permitted by HTML

This is CSS block and inline, not HTML block and inline.  In CSS, you can have a
block child of an inline.

The HTML thing is a parse-time constraint, not a layout-time one.  XTF is parsed
as XML, not by HTML rules, no?

Comment 7

[Darin Fisher]

bz: very interesting, thanks for the info.  XTF is parsed as XML, yes.  i was
assuming XHTML inherited the same rule from HTML.

Comment 8

[Boris Zbarsky [:bzbarsky]]

No, XHTML is parsed as XML; any tag is allowed to contain any other tag (eg
<img> can contain kids).

Comment 9

[Allan Beaufour]

We solved this a long time ago, isn't this INVALID?