"A FLIF image can be loaded in different ‘variations’ from the same source file, by loading the file only partially. This makes it a very appropriate file format for responsive web design. "

Awesome! I have been toying with custom png 'container' ideas in the past offering similar 'responsive' features (i.e various resolutions, lossy-lossless versions)

I would like to see the ASM.js version of the decoder and see how that one performs.