410303 - closing / on img tags removed during rendering

Status: RESOLVED DUPLICATE of bug 162653

(Firefox :: General, defect)

Description

[dampjam]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11

Install the html validator extension: http://users.skynet.be/mgueury/mozilla/ (it lets you see the source code post-render (right click on icon, advanced, validate now).

When you view an xhtml 1.0 page sent as text/html (which is valid under the spec: http://www.w3.org/TR/xhtml1/#media as long as you specify doctype), firefox makes the page non-valid xhtml post-render by removing the closing img tag.

i.e <img src="myimage.jpg" alt="my image"/> becomes <img src="myimage.jpg" alt="my image">

Reproducible: Always

Steps to Reproduce:
1. Create an xhtml 1.0 strict page with images
2. Make your browser send the mime type text/html
3. Your page is actually invalid xhtml post-render
Actual Results:  
You get invalid xhtml

Expected Results:  
Your trailing / stays as part of the img tag.

Why does this affect developers?
Javascript modifies a lot of webpages and due-diligence with compatibility dictates that the code is both valid pre and post javascript events.  Unfortunately when I use the html validator extension to extract the post-render source code from firefox, firefox has already mangled the true xhtml.

There is no work around to this except knowing to ignore this validation error while developing websites.

Comment 1

[Kevin Brosnan]

Read comment 6

Comment 2

[Boris Zbarsky [:bzbarsky]]

> When you view an xhtml 1.0 page sent as text/html (which is valid under the
> spec: http://www.w3.org/TR/xhtml1/#media as long as you specify doctype)

It's valid if you do that _and_ the document complies with Appendix C of the XHTML specification.  And even then, all that's guaranteed is that anything complying with Appendix C will give about the same DOM no matter whether parsed as XHTML or tag-soup.