235015 - load background images even it is not visible in the viewport

Status: RESOLVED DUPLICATE of bug 57607

(SeaMonkey :: General, defect)

Description

[Sekundes]

User-Agent:       
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7a) Gecko/20040219

I can't find any information why Mozilla does not load the background images
when they are not visible in the viewport.
The URL provided heavily used background images which fully reflects the problem.
When we scroll down the scrollbar, the second background image(A house with a
road) started to load until we can see the area of the background image positioned.
And Mozilla treats the third one with same behaviour and so on.
Therefore we have to wait continuously until they are all loaded.

The same problem is produced by the widely used of hover navigation list with
background images by CSS designers.
When you move your mouse to the navigation list, the items used background
images are shown. Per the Mozilla's behavior, the hover list would show first
and attach the background images until it is loaded.
However, before the images are loaded, the text of item are shown and the text
will be overlapped. Also, no end user would know the list has background images
or not. They would only think it's the fault of Mozilla until they can load the
background images successfully.
Here is the example which used the hover navigation list I mentioned above.
http://www.csszengarden.com/?cssfile=http://www.inet.hr/~mdugonji/webdesign/experiments/lemon_aid/sample-file.css

Reproducible: Always
Steps to Reproduce:
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Comment 1

[Christian :Biesinger (don't email me, ping me on IRC)]

>I can't find any information why Mozilla does not load the background images
>when they are not visible in the viewport.

because that's somewhat hard to do...

known bug though.

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