| <?php |
| header("Link: <http://127.0.0.1:8000/resources/square.png?nonzero>;rel=preload;as=image;media=\"(min-width: 1px)\"", false); |
| header("Link: <http://127.0.0.1:8000/resources/square.png?zero>;rel=preload;as=image;media=\"(width: 0px)\"", false); |
| ?> |
| <!DOCTYPE html> |
| <meta name="viewport" content="width=device-width"> |
| <script> |
| window.addEventListener("load", function() { |
| var entries = performance.getEntriesByType("resource"); |
| var nonzeroLoaded = false; |
| for (var i = 0; i < entries.length; ++i) { |
| if (entries[i].name.indexOf("?zero") != -1) |
| window.opener.postMessage("zeroloaded", "*"); |
| if (entries[i].name.indexOf("?nonzero") != -1) |
| nonzeroLoaded = true; |
| } |
| if (nonzeroLoaded) |
| window.opener.postMessage("success", "*") |
| else |
| window.opener.postMessage("nonzeronotloaded", "*"); |
| }); |
| </script> |
| <script src="/resources/slow-script.pl?delay=200"></script> |
| |
