Add new markup for support of "srcset-w"

[nhoizey]

Most responsive image needs require only the srcset-w attribute on the <img> tag, <picture> being necessary only for Art Direction:
http://blog.cloudfour.com/dont-use-picture-most-of-the-time/

[btobolaski]

That was very enlightening, thank you. So going on that information, this plugin shouldn't generate <picture> tags at all, since it just generates a series of resized images. My plan is to add the srcset markup option and then depreciate the picture markup.

I have a plan for how I'd like the srcset markup option to work and I'll try it out when I get a chance.

[nhoizey]

I think <picture> is also useful, but only if we can provide several images in our content, which might be difficult, so srcset-w should be the default/example configuration, yes.

It's really great to know you have a plan!

[kaffolder7]

Hi @btobolaski — curious if you ever took a stab at adding in srcset functionality to this plugin? I couldn't agree more that supporting the picture spec by using srcset markup is the best option right now. I started trying to make the switch myself, but sadly I am not much of a Ruby developer. Care sharing any progress you may have made with this, or even what some of your thoughts were regarding plan/setup?