// this fails in Safari!? Nothing shows up!? I wonder why!
// do I want to explain the whole caching behavior of chrome and why this won't work like you probably expect it to – and that that's for the best? maybe...
// do I want to include an example of what to do if you want to style your image to be smaller than full width? probably?
// placehold.it example
// (which has to kind-of-manually maintain a constant aspect ratio)
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