Am 13.08.2012 18:39 schrieb Henri Sivonen:
Ignoring implementation issues for a moment, I think it would be
conceptually easier it to disentangle these axes like this:
Non-art directed:
<img src="1xsampling.jpg" hisrc="2xsampling.jpg" alt="Text alternative">
Art directed:
<picture>
<source src="1xsampling-cropped.jpg" hisrc="2xsampling-cropped.jpg"
media="max-width: 480px">
<img src="1xsampling.jpg" hisrc="2xsampling.jpg" alt="Text alternative">
</picture>
I like this hisrc approach for its simplicity; it depends on the
question whether a limit of 2 sources for the bandwidth use case is
considered to be okay.
Anyway, I think it is an important question, as there may be future use
cases that require more than 2 sources, such as providing an extra
source for printing (which may be a 3x or 4x pixel format or a vector
format), or progressive loading of sources as I described here:
http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-August/036884.html
Anyway both these cases are hypothetic, and the print use case may also
be solved via <picture> and media="print". From an author's POV, hisrc
looks quite intuitive and easy to use to me.
