main frame - DidStartNavigation
main frame - ReadyToCommitNavigation
main frame - didCommitLoadForFrame
frame "<!--framePath //<!--frame0-->-->" - BeginNavigation request to 'data:application/pdf;base64,', http method GET
frame "<!--framePath //<!--frame0-->-->" - DidStartNavigation
main frame - didFinishDocumentLoadForFrame
frame "<!--framePath //<!--frame0-->-->" - didFailProvisionalLoadWithError
main frame - didHandleOnloadEventsForFrame
main frame - didFinishLoadForFrame