209132 - Page done, but images only appear when scrolled into view

Status: RESOLVED DUPLICATE of bug 57607

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

Description

[José Jeria]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.5a) Gecko/20030611
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.5a) Gecko/20030611

For a while now I noticed that even though the page says its done, when
scrolling down to unseen content, you see that images are not shown. When
scrolling the page they "popup". 
This gives the impression that the images ARE loaded, but they are not shown
until you actullay scroll the page. You get this appearing images suddenly. This
happends sometimes with images (backgrounds, list images etc). Clear cache to
see this effect.

Reproducible: Always

Steps to Reproduce:
1. Empty cache and go to for example http://www.idg.se
2. Wait for page to load
3. Now scroll to the bottom, you will se the bottom blue image appear when you
scroll down the page

Actual Results:  
Image not shown, until you scrolled the page. Image then appeared.

Expected Results:  
If page is done loading, images should be visible when scrolling down.

Comment 1

[José Jeria]

Another way to reprodue this:
1. Empty cache.
2. Open new tab and go to http://gemal.dk/mozilla/blogupdates.html
3. As soon as you press "go", switch back to the tab you were on. Wait for the
page to finish loading.
4. Now switch to the new page, even though it finish loading you will see that
the images (link arrows) will popup. 

Comment 2

[Jim Dunn]

We do load any background image at *expose* time to speed up downloading.
So this is done by design.  However, we might want to look at only 
doing this for document backgrounds and not for element backgrounds.

Comment 3

[Chris Casciano]

-> All/All, however it wouldn't surprise me if this is being discussed in
another bug already

(and yes... I also think the current behavior /looks/ a lot like a bug even if
its done intentially)

Comment 4

[Chris Casciano]

oops... really changing (OS X)... sorry for the extra spam

Comment 5

[Boris Zbarsky [:bzbarsky]]

*** This bug has been marked as a duplicate of 57607 ***