310554 - HTML comments aren't displayed correctly when any doctype is defined

Status: VERIFIED INVALID

(Firefox :: General, defect)

Description

[Andreas Tylmann]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; de-DE; rv:1.7.8) Gecko/20050511 Firefox/1.0.4
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; de-DE; rv:1.7.8) Gecko/20050511 Firefox/1.0.4

Look at the source of the mentioned url, it is reduced to the absolute minimum
for displaying the bug. Problem: Inside a HTML-Comment there is a <p>-tag with
two lines (--) inside. Firefox recognizes the end </p>-tag as end of my comment.
(could be any tag, the <p> is only an example)
This bug only occurs when any doctype is defined.

Reproducible: Always

Steps to Reproduce:
1. create an empty html-page, define a doctype inside
2. add any comment with any tag inside
3. place two lines (--) anywhere in the text inside the tag. (for example <p>foo
-- bar</p>)
4. view the page in firefox -> it isn't displayed correctly
Actual Results:  
firefox recognizes the end-tag as end of comment. '-->' is displayed

Expected Results:  
display nothing, because every text is inside the comment

Comment 1

[Uri Bernstein]

Invalid. See:

http://www.w3.org/TR/REC-xml/#sec-comments
('the string "--" (double-hyphen) MUST NOT occur within comments.')

Also
http://developer.mozilla.org/en/docs/Gecko_Compatibility_Handbook#Invalid_Comments
http://developer.mozilla.org/en/docs/HTML:The_Importance_of_Correct_Commenting#XML

(from bug 309974 comment #4).