[vasi]

I mostly agree with you, but you're incorrect about WebCore/WebKit. For the first couple of years of WebKit development, Apple did indeed only release WebCore, but since 2005 all of WebKit has been released. Otherwise, how could Gnome (Epiphany), KDE (rekonq), Chromium, etc be using it?

[saurik]

Apple keeps an internal fork of WebKit that has numerous abilities not in their public trees, which happens to be why Android and WebOS both have totally incompatible mechanisms for adding multi-touch support to JavaScript despite iOS having been out with that functionality for years prior.