Graph approach can be extended to entire web browsing. From page A, you open page B, but you also open page B, from page C. Tree-style browsing will result in o

Graph approach can be extended to entire web browsing. From page A, you open page B, but you also open page B, from page C. Tree-style browsing will result in opening/seeing page B twice and also not (easily) seeing that came to B from both A and C.