for certain elements, a quinesque approach might not be that useful, but source could be displayed juxtaposed to results. (to show numbered lists, do you want to display the ol tags before the numbers (thus using fake numbers) or do you let ol numbering tags tag the elements with numbers and then show the source inside that?)

btw it really drives me crazy that browser implementors think that when I copy/paste a numbered list, I somehow don't want the numbers.