12. The computer-implemented method of claim 8 , further comprising determining at least one difference between at least two of the plurality of versions of the network resource.
12. The computer-implemented method of claim 8 , further comprising determining at least one difference between at least two of the plurality of versions of the network resource. 14. The computer-implemented method of claim 12 , wherein the at least one difference comprises a difference in at least a portion of visual content of the at least two of the plurality of versions of the network resource.