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The "Page Size" line already contains some details as to where size is lost. Pages typically contain multiple images. Being able to see the list of images sorted by descending size would help authors know where they can most efficiently take precious KB. Add a '+' expandable section to make it possible to view the details using a bit of Javascript. Default view when Javascript is not enabled: the expanded view, or the same one as current one if that turns out to take too much place.
Implemented using JQuery. The expanded table is not displayed when Javascript is off, it really takes too much space.