[whatwg] <img srcset> for responsive bitmapped content images

[Boris Zbarsky]

On 5/10/12 10:19 AM, Mathew Marquis wrote:
> Hey guys. Don’t know if it’s too early to chime in with this, but we were told by some members of the Chrome team that any browser that supports DNS prefetching — including assets — wouldn’t consider “looking-ahead” on the img tag as an option.

Why not?  In any case, _DNS_ prefetching would be the same for both the 
low-res and high-res image, I would think.

> The original src would be fetched in any case, saddling users with a redundant download.

That sounds like image prefetching, not DNS prefetching.  I see no 
obvious reason it couldn't look at multiple attributes.

-Boris