What's being used under the hood in Qt 5.0.1 QWebView

I think this should be straightforward but I can’t seem to find documentation that spells these things out clearly… I have downloaded Qt 5.0.1 and I’m building it on Windows. I plan to build a simple example C++ app with a QWebView within it. When I run this: Is WebKit or WebKit 2 being used? Is there any way I can tell? Is JavaScriptCore or V8 being used? Is there any way I can tell? Is the Chromium API found in the source tree at qtwebkit\Source\Platform\chromium being used? How can I tell? Are all of these things compile time settings, or runtime settings, or just automatic? As I have said, I have already searched documentation to try to find answers to these questions, but other than the ‘what’s new in Qt 5’ page, I’ve really found nothing that talks about distinctions between WebKit and WebKit 2, JavascriptCore and V8, and Chromium. Thanks, Stan