Do we need img highsrc for firefox3 zoom?

[Jeff]

Not that firefox is the first to have it, but now that I'm using firefox 3, I'm aware of the zoom feature which not only zooms text but the whole page; I imagine this will be quite useful for for many viewing on high resolution / size screens. But as a photographer, I cringe a bit too, as once zoomed, you're no longer viewing the images as intended but instead are upsampling highly-compressed jpeg images really bringing out the artifacts. In the old days we had the lowsrc attribute to specify a low res image while the high res image was loading. I wonder if we now need an img highsrc attribute to specify a high resolution image to be used for those zooming in? Or is there already a way people are doing this somehow to present a crisp image when the page is viewed with a browser set to zoom to 150%, 200%, or more?

[Randall]

Good question. Short of inventing still more non-standard HTML, I'd guess the browser would have to expose this through Javascript ... looks like Mozilla has that one covered already.

And here's a way to use Flash to detect zooming in general. Harnessing Zoomify might be the best overall solution, since it seems to operate independently of the page zoom -- the container gets bigger but the pixels don't (tested in Firefox 3, don't know how IE7 or Opera react).

edit: Well, maybe not. Zoomify hijacks the Control and Command keys, so as soon as you start interacting with the image you lose control over the page zoom.

Randall