synchronize_with_unload_wait: wait until after loadEventEnd, not domComplete
synchronize_with_unload_wait: wait until after loadEventEnd, not domComplete

the thinkning goes that we should allow the page to run any event handler
setup code it needs to before we go and start trying to interact with things

alphagov/digitalmarketplace-functional-tests,alphagov/digitalmarketplace-functional-tests,alphagov/digitalmarketplace-functional-tests