Optional referer?: stringOptional waitWhen to consider operation succeeded, defaults to load. Events can be either:
'domcontentloaded' - consider operation to be finished when the DOMContentLoaded event is fired.'load' - consider operation to be finished when the load event is fired.'networkidle' - DISCOURAGED consider operation to be finished when there are no network connections for
at least 500 ms. Don't use this method for testing, rely on web assertions to assess readiness instead.'commit' - consider operation to be finished when network response is received and the document started
loading.
Referer header value. If provided it will take preference over the referer header value set by page.setExtraHTTPHeaders(headers).