The unloadEventStart
read-only property returns a timestamp
representing the time value equal to the time immediately before the user agent starts the unload event of the previous document. If there is no previous document, this property returns 0
.
A timestamp
representing the time value equal to the time immediately before the user agent starts the unload event of the previous document.
The following example illustrates this property's usage.
function print_nav_timing_data() {
var perfEntries = performance.getEntriesByType("navigation");
for (var i=0; i < perfEntries.length; i++) {
console.log("= Navigation entry[" + i + "]");
var p = perfEntries[i];
console.log("DOM content loaded = " + (p.domContentLoadedEventEnd - p.domContentLoadedEventStart));
console.log("DOM complete = " + p.domComplete);
console.log("DOM interactive = " + p.interactive);
console.log("document load = " + (p.loadEventEnd - p.loadEventStart));
console.log("document unload = " + (p.unloadEventEnd - p.unloadEventStart));
console.log("type = " + p.type);
console.log("redirectCount = " + p.redirectCount);
}
}