1 main frame - didStartProvisionalLoadForFrame
2 main frame - didCommitLoadForFrame
3 main frame - didFinishDocumentLoadForFrame
4 main frame - didHandleOnloadEventsForFrame
5 postProgressFinishedNotification
6 main frame - didFinishLoadForFrame
7 This is a test of progress finished callback ordering in relation to frame loader callbacks. It is only useful inside the regression test tool.