An extraposed object clause is one that has the dummy pronoun 'it' as object and a subordinate clause as extraposed object: I find it disappointing that he gave up . Here, the dummy pronoun 'it' functions as object, and the subordinate clause 'that he gave up' functions as extraposed object, although it is not actually a kind of object but just an embedded content clause. The meaning of 'it' is obtained from the extraposed object, so we understand: 'I find the fact that he gave up disappointing'.
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