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Re:Faster Images using HTTP2 and Progressive JPEGs by kuon on Wednesday December 28, 2016 @08:06AM (#13270200)
I know it's a hack, but what is wrong with it? I've always been using that and it works.

I haven't looked in details into the new srcset and size attributes of image, but won't that help also?

Re:Faster Images using HTTP2 and Progressive JPEGs by woof on Wednesday December 28, 2016 @08:22AM (#13270284)
<picture> with multiple srcset makes it possible to serve images that are displayed at 100% width, filling their (DOM) container.

Check out http://scottjehl.github.io/picturefill/