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First, remove any <image-set-option>s from the list that specify an unknown or unsupported MIME type in their type() value.
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Finally, among the remaining <image-set-option>s, make a UA-specific choice of which to load, based on whatever criteria deemed relevant (such as the resolution of the display, connection speed, etc).
What if there are no remaining options? Firefox chooses just the first here but that's fairly arbitrary as well.