584000 - HTML parser bug: <!-- -- ... --> comment tag is treated as text.

Status: VERIFIED DUPLICATE of bug 102127

(Firefox :: General, defect)

Description

[Dmitry Stepanov]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8

See attached URL.

Reproducible: Always

Steps to Reproduce:
1. open http://www.stepanov.lv/pub/mozilla/bugs/mozilla_html_parser_bug.html
2. watch
Actual Results:  
Comment tag is treated as text

Expected Results:  
Comment tag should be treated as comment

Comment 1

[Alice0775 White]

See https://developer.mozilla.org/en/The_Importance_of_Correct_HTML_Commenting

Comment 2

[Mardeg]

This is a dupe of bug 102127 unless the author switches to HTML5 doctype in which case it should be duped to bug 214476

Comment 3

[Jo Hermans]

I don't understand why everybody immediately claims that this is an error, while any HTML-checker will immediately tell you what is wrong. Do NOT use -- inside a comment !

http://validator.w3.org/check?uri=http%3A%2F%2Fwww.stepanov.lv%2Fpub%2Fmozilla%2Fbugs%2Fmozilla_html_parser_bug.html&charset=%28detect+automatically%29&doctype=Inline&group=0

Comment 4

[Dmitry Stepanov]

My bad. Didn't even thought that -- inside comment tag could cause such a hassle. Well, FAIL.

Comment 5

[Dmitry Stepanov]

(In reply to comment #4)
> My bad. Didn't even thought that -- inside comment tag could cause such a
> hassle. Well, FAIL.

By the way, Safari, FF, Chrome, Opera handle this well, irregarding of W3C spec. Seems like guys from Apple, Mozilla, Google and Opera intuitively felt to allow -- to be within comment tag would be right thing to do.

Comment 6

[Dmitry Stepanov]

OMG, not Mozilla, Microsoft i meant and IE.

Comment 7

[Jo Hermans]

(In reply to comment #5)
> (In reply to comment #4)
> > My bad. Didn't even thought that -- inside comment tag could cause such a
> > hassle. Well, FAIL.
> 
> By the way, Safari, FF, Chrome, Opera handle this well, irregarding of W3C
> spec. Seems like guys from Apple, Mozilla, Google and Opera intuitively felt to
> allow -- to be within comment tag would be right thing to do.

That's because they're not correct (the HTML standard explicitly forbids it). It has been a problem since the early 90's. But that part of the standard was changed in HTML5, among various other improvements in the parser. SGML compliance is not needed anymore.