578947 - error occur when recognizing html comment statement

Status: RESOLVED DUPLICATE of bug 214476

(Core :: General, defect)

Description

[OceanLiu]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 ( .NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 ( .NET CLR 3.5.30729)

original html file is like：
<!-- AD zone start-->
<AD pic>
<!-- AD zone end -->
when I want to delete the ad picture，i delete the two dashes‘-’in first comment statement：
<!-- AD zone start>
<AD pic>
<!-- AD zone end -->
this two statement and the picture should be considered as a comment statement block, but ff shows a sentence<!-- AD zone start> and then the picture.

Reproducible: Always

Steps to Reproduce:
1.write some html file
2.including a comment statement like this:
<!-- AD zone start>
<!-- AD zone end -->

Actual Results:  
a sentence <!-- AD zone start>

Expected Results:  
nothing(because this is a comment statement block begin with the first‘<!--’ and end with ‘-->’)

Comment 2

[Boris Zbarsky [:bzbarsky]]

Verified.  Note that in HTML4 comments end with -- and start with --, so what you have is an unclosed comment (since you close the comment and then reopen it agai), which is then reparsed with looser comment parsing...

HTML5 changes the spec to align with what you seem to expect to happen.