440879 - Firefox stops rendering iframe content after 32k pixels

Status: RESOLVED DUPLICATE of bug 333994

(Core :: Layout: Images, Video, and HTML Frames, defect)

Description

[edwardtalcott]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9) Gecko/2008052906 Firefox/3.0

Once an iframe's height exceeds 32767 pixels, Firefox simply stops rendering the remaining iframe content and only renders the iframe background (this includes not rendering the horizontal scrollbar although if you know where it is, you can still click or drag it).


Reproducible: Always

Steps to Reproduce:
1. Create an html file that produces at least 32767 pixels (height) of content
2. Create another html file which creates an iframe referencing the first file as the source. Make the height of the iframe 32773 pixels for the clipping to be obvious (it will clip half of the scrollbar at that number.
3. Open the 2nd file in Firefox and scroll using the main browser scrollbar all the way to the bottom of the page.
Actual Results:  
Here is an image of what I see at the bottom of the browser window. The orange color is just the iframe background color that I used to make the problem more prominent.
http://img78.imageshack.us/img78/2122/firefox32kclippingol4.png

Expected Results:  
I expected all the content to be rendered visibly.

This bug occurs in both FF2 and FF3.

Comment 1

[Brian Polidoro]

Roc is this Bug 215055?

Comment 2

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Yeah, I think so.

Comment 3

[Daniel.S]

(In reply to comment #2)
> Yeah, I think so.

At least the same symptoms. -> Dupe.

Comment 4

[Lucas Malor (mail: c6kfnkn2uc AT snkmail DOT c0m)]

Attachment: Minimal testcase: signed integers used!

I's not exactly a duplicate, I'll reopen it. 

See the attached testcase: Bug 215055 is about elements with overflow!=visible. Furthermore for iframes seems Fx uses signed integers, while for divs it uses unsigned. 

So a part of this bug seems simple to fix. The other part (iframe can't be taller than 16 bit) is probably related to Bug 215055.