276865 - Images always downloaded when serving as application/xhtml+xml

Status: RESOLVED INVALID

(Core :: XML, defect)

Description

[Doug Wright]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.7.5) Gecko/20041108 Firefox/1.0
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.7.5) Gecko/20041108 Firefox/1.0

I've noticed that all resources are fetched when using application/xhtml+xml
even those in <noscript></noscript> or set to display:none. I noticed this
because I have a tracker image in a <noscript> to determine % of users with JS
disabled. When serving as application/xhtml+xml Mozilla always attempts to
download this image, regardless of JS being enabled or not. When serving as
text/html the image is not fetched.

I'm not sure if this is related to bug 18333 (do we download *everything* before
rendering, or just wait for the XHTML?)

Reproducible: Always

Steps to Reproduce:

Comment 1

[Boris Zbarsky [:bzbarsky]]

This is likely the correct behavior for XML, since we _do_ want to create an
image node for the <img> tag (in HTML we mess with the DOM and don't create an
<img> node, but that's not an option in XML).  See also bug 242298.

Comment 2

[Doug Wright]

(In reply to comment #1)
> This is likely the correct behavior for XML, since we _do_ want to create an
> image node for the <img> tag (in HTML we mess with the DOM and don't create an
> <img> node, but that's not an option in XML).  See also bug 242298.

Is this a 'valid' bug or not? (being UNCO it's heading for auto-resolving...)

Comment 3

[Boris Zbarsky [:bzbarsky]]

Whether it's valid basically depends on the outcome of bug 242298.... Confirming
for now, pending that.

Comment 5

[Henri Sivonen (:hsivonen) (not reading bugmail until 2026-07-27)]

Resolving INVALID in the "not a bug" sense. The behavior here is compliant with the HTML spec now. The spec says:
"The noscript element must not be used in XML documents. Note: The noscript element is only effective in the HTML syntax, it has no effect in the XHTML syntax."