Hmm, playing some more with Sigil's report feature, it seems to be rather buggy. For example, it fails to detect images used in CSS files or <style> tags via url(). I didn't bother to try style attributes, but I'm pretty sure they wont be detected either.
Given it's other limitations, I am really surprised all of you seem to be using it productively, but, since you are, I guess I will look into implementing it in calibre (properly).
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