11. The method of claim 1 , wherein the at least one markup language document comprises executable instructions that, when executed by a viewing application that processes and displays visible content elements of the at least one markup language document, cause the viewing application to perform the identifying and the automatically determining, and the identifying and the automatically determining comprise executing, with the viewing application, the executable instructions.
11. The method of claim 1 , wherein the at least one markup language document comprises executable instructions that, when executed by a viewing application that processes and displays visible content elements of the at least one markup language document, cause the viewing application to perform the identifying and the automatically determining, and the identifying and the automatically determining comprise executing, with the viewing application, the executable instructions. 13. The method of claim 11 , wherein the executable instructions define the identifying and the automatically determining to be independent of the at least one markup language document and applicable to other markup language documents.