On this page I try to find out which browsers support the lowsrc attribute for images. It isn't easy.

only lowsrc

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.

lowsrc and src

Then an <img> with both a lowsrc and a src.

src is 404

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.