Back when Chrome was based on WebKit, my recollection is that WebKit was vaguely half the code. The other half was all the stuff that browsers do that's easy t

Back when Chrome was based on WebKit, my recollection is that WebKit was vaguely half the code. The other half was all the stuff that browsers do that's easy to overlook -- the network stack, process management, 2d graphics engine, cookie management, the URL bar, v8, extensions, etc. And these pieces are the very things that Chrome differentiated and succeeded based on. (WebKit on Mac includes more of these things, but many of them rely on Mac-specific implementations, which weren't as useful for a browser that is primarily used on Windows.)