I was recently looking into some prebuilt libs for emoji support on web. One of them had a sprite, the other used data URI's in all of the background-image:url() parts of their core CSS. The sprite was crunched down to about 500k after some optimization tweaks (pngout, etc.) the data uri version could not be optimized, it's CSS file weight in at over 5MB.The decision was pretty easy to make after that discovery.
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