On this page I try to find out which browsers support the lowsrc attribute for
images. It isn't easy.
Based on this test alone, lowsrc is supported by Explorer and Netscape 4.
Mozilla, Opera 7 and Safari don't show anything.
First an <img> with only a lowsrc definied.
Then an <img> with both a lowsrc and a src.
Now only Explorer on Mac shows the lowsrc image. All other browsers show a broken image.
Netscape 4 reacts very oddly to this test. It tries to show the lowsrc image, but when you scroll the page odd things start to happen.
Finally an <img> with a lowsrc and a src, but the src
refers to a non-existing image.