Looking at the srcset proposal it appears to be recreating aspects of media-queries in a terse less obvious form...
<img src="face-600-200 at 1.jpeg" alt="" srcset="face-600-200 at 1.jpeg 600w 200h 1x, face-600-200 at 2.jpeg 600w 200h 2x, face-icon.png 200w 200h"> We've already got media queries so surelt we should be using them to determine which image should be used and if media-queries don't have features we need then we should be extending them... I'd like to see media-queries extended to support bandwidth, svg etc., then we give developers the option to detected features and choose media types appropriately. Andy