
PASS document.open() does not abort documents that are not navigating (XMLHttpRequest) 
PASS document.open() does not abort documents that are not navigating (fetch()) 
PASS document.open() does not abort documents that are not navigating (image loading) 
PASS document.open() does not abort documents that are not navigating (establish a WebSocket connection) 
PASS document.open() does not abort documents that are not navigating (already established WebSocket connection)