| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <meta name="viewport" content="width=device-width"> |
| <title>Child Iframe</title> |
| <h1>Child Iframe observing long tasks</h1> |
| |
| <script> |
| var observer = new PerformanceObserver(function(entryList) { |
| for (i = 0; i < entryList.getEntries().length; i++) { |
| var longtask = entryList.getEntries()[i]; |
| // Ignore long task generated within here, as part of making this iframe. |
| if (longtask.name == "same-origin-self") |
| return; |
| // TODO(panicker): include frameId etc. |
| var entryContents = longtask.entryType + '+' + longtask.name + '+' + longtask.attribution[0].name; |
| top.postMessage(entryContents, '*'); |
| } |
| }); |
| observer.observe({entryTypes: ["longtask"]}); |
| </script> |
