221862 - Content of <xsl:comment> tags are completly ignored when parsing XML. HTML output ist fine.

Status: RESOLVED INVALID

(Core :: XSLT, defect)

Description

[Hannes]

User-Agent:       Mozilla/5.0 (Windows; U; WinNT4.0; en-US; rv:1.4) Gecko/20030624
Build Identifier: Mozilla/5.0 (Windows; U; WinNT4.0; en-US; rv:1.4) Gecko/20030624

If you use <xsl:comment> within a <style type="text/css"> tag in your XSLT, the
CSS commands are ignored and not aplied to the page. Same with Java Script.
The rendered HTML looks perfect, <style type="text/css"><!-- ... . If page is
saved to HTML and reopened, everything works fine.

Reproducible: Always

Steps to Reproduce:
1. Download the attatched simple XML file and save it /some/where/test.xml:
2. Download the attatched simple XSL file and save it /some/where/test.xsl:
3. Drop XML into Mozilla
4. File/SavePageAs /some/where/test.html
5. Open test.html

Actual Results:  
The .XML File does not show pink text, the .HTML file does.

Expected Results:  
Both should show pink text

Comment 1

[Hannes]

Attachment: simple XML File to call XSL

Comment 2

[Hannes]

Attachment: Simple XSL to demonstrate bug

Comment 3

[Hannes Erven]

Confirmed on Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20030925

Comment 4

[Axel Hecht]

Funny. Folks confirm, but don't confirm, and yet don't know what's happening.

This is a significant difference between serializing and non-serializing XSLT
processors.
http://www.w3.org/TR/1999/REC-html401-19991224/interact/scripts.html#h-18.3.2
states that the "comment" tags inside html script elements are not comments.
That is due to the fact, that script tags are CDATA elements,
http://www.w3.org/TR/1999/REC-html401-19991224/sgml/dtd.html#Script
that is, they don't contain markup. As such, there is no comment beneath the
script or the style element and the string '<!--' is fed to the js engine
and ignored over there.
In a scheme where the XSLT processor does not serialize, we actually do generate
a comment beneath the script element, which is ignored.

The XSLT spec doesn't give any argument to handle it differently, so we stick
to this scheme of dynamic content generation. More so, as the pseudo-comment 
is to deal with user agents not capable of style or script, unlikely to happen
with a user agent aware of XSLT.

Note to self, add this to the FAQ.

Comment 5

[Hannes]

Attachment: Screenshot of IE

Screenshot how IE interprets XSL as expected

Comment 6

[Hannes]

Attachment: Screenshot of MOZILLA

Screenshot how MOZILLA interprets XSL without respecting the information given
in the Style Tag.

Comment 7

[Hannes]

> In a scheme where the XSLT processor does not serialize, we actually do
> generate a comment beneath the script element, which is ignored.

Yes, correct, as described in
http://www.w3.org/TR/1999/REC-html401-19991224/present/styles.html#hiding this
is the way to hide the content of STYLE elements from non-conforming user agents.

But what is happening here is, that it is eaven hid from conforming Mozilla. The
Information of the <STYLE> tag is not applied to the Document.

JS is all the same.

Comment 8

[Axel Hecht]

you want
<script>&lt;--
 // do stuff
 // --&gt;
<script>

Comment 9

[Axel Hecht]

*** Bug 222775 has been marked as a duplicate of this bug. ***