main frame - didStartProvisionalLoadForFrame main frame - didCommitLoadForFrame frame "-->" - didStartProvisionalLoadForFrame frame "-->" - didCommitLoadForFrame frame "-->" - didFinishDocumentLoadForFrame frame "-->" - didHandleOnloadEventsForFrame frame "-->" - didFinishLoadForFrame CONSOLE WARNING: line 12: Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/. main frame - didFinishDocumentLoadForFrame main frame - didHandleOnloadEventsForFrame main frame - didFinishLoadForFrame frame "-->" - didStartProvisionalLoadForFrame frame "-->" - didCommitLoadForFrame frame "-->" - didFinishDocumentLoadForFrame frame "-->" - didHandleOnloadEventsForFrame frame "-->" - didFinishLoadForFrame This test is to test whether preload image will require 2 more requests or not. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". Image was preloaded: TRUE PASS count is "1" PASS successfullyParsed is true TEST COMPLETE