[drdaeman]

> The notion of a "pixel-perfect design" doesn't belong on the web.

So, if this is the case, then "px" units and raster graphics should not belong on the Web, too. But unfortunately, they do.

IMHO, the best approach would be to have two zoom modes. Some users prefer scaling text, but keeping images inact (so they won't see upscale ugliness), others prefer "screen magnifier"-like behavior. And none of those behaviors is wrong.