I am planning to track page load time in Javascript with the help of Performance Navigation API. But , It is not supported in safari. Here is the code:
*var performance = window.performance;
var timet = performance.getEntriesByType("navigation")[0].duration;*
Receiving an error "Performance" is undefined. It seems Performace API is deprecated. Is there any alternate way to capture page load time using Javascript?
The problem is that performance.getEntriesByType("navigation") returns an empty array in Safari (still the case as of Safari 14...)
Relevant bug: https://bugs.webkit.org/show_bug.cgi?id=184363
Note that you can use the old version of the API exposed as performance.timing
https://developer.mozilla.org/en-US/docs/Web/API/Performance/timing
It doesn't have all the same data and some data might have different format though.