From Bugzilla Helper: User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows 98; Win 9x 4.90) BuildID: 2002020406 A iframe wider or higher than 2200 at the scroll of the MAIN page (in the direction larger than 2200) is not anymore rendered after passing the 2200 line --appears a white or background color area-- and the iframe's scrollbar parallel with the scrolling direction is "erased" --a strange pattern appears. I'm not 100% sure, but I think the barrier is more accuratly at 2184. Reproducible: Always Steps to Reproduce: 1.Build a large file --a file that once in the iframe will have content (text, images...) for the height or width > 2200 . 2.Build the main file that includes a iframe with source = the previous file. Inside inframe tag put height="2500" or width="2500" (or both if you have a realy big iframe file). 3.Scroll the main page in the large direction. Actual Results: The iframe was not rendered after scrolling the main page further then 2200. Expected Results: Render the entire iframe at the scroll of the main page.

This probably happens when the size overflows the 16-bit-int size limit on widgets...

This should be fixed now. We used to create an offscreen drawing surface which was the same size as the dimensions of the iframe. Now the offscreen is the size of the damaged area only.