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When we can safely access all performance.timing properties
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| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>When We Can Safely Access all performance.timing properties</title> | |
| <script> | |
| debugger; | |
| </script> | |
| </head> | |
| <body> | |
| <main id="main"></main> | |
| </body> | |
| <script> | |
| function timingReady () { | |
| var out = document.querySelector('main'); | |
| var timing = window.performance.timing; | |
| out.innerHTML += "<p>Total Response Time: " + (timing.responseEnd - timing.requestStart) + "ms</p>"; | |
| out.innerHTML += "<p>Time Until Page Loaded: " + (timing.loadEventEnd - timing.navigationStart) + "ms</p>"; | |
| } | |
| if ('performance' in window && window.performance.timing) { | |
| // <http://caniuse.com/#feat=nav-timing> | |
| if (document.readyState == 'complete') { | |
| // If this script is being included asynchronously later on then the load event has already fired. | |
| timingReady(); | |
| } | |
| else { | |
| // The browsers that don't support the timing API also don't support #addEventListener (IE < 9). | |
| window.addEventListener('load', function () { | |
| // loadEventEnd isn't available until after the 'load' event is finished. | |
| setTimeout(timingReady, 1); | |
| }); | |
| } | |
| } | |
| else { | |
| document.getElementById('main').innerHTML = 'browser not supported'; | |
| } | |
| </script> | |
| </html> |
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