PerformanceNavigationTiming.loadEventStart

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The loadEventStart read-only property returns a timestamp representing the time value equal to the time immediately before the load event of the current document is fired.

Value

A timestamp representing a time value equal to the time immediately before the load event of the current document is fired.

Examples

The following example illustrates this property's usage.

function print_nav_timing_data() {
  // Use getEntriesByType() to just get the "navigation" events
  const perfEntries = performance.getEntriesByType("navigation");

  for (let i=0; i < perfEntries.length; i++) {
    console.log("= Navigation entry[" + i + "]");
    const p = perfEntries[i];
    // dom Properties
    console.log("DOM content loaded = " + (p.domContentLoadedEventEnd - p.domContentLoadedEventStart));
    console.log("DOM complete = " + p.domComplete);
    console.log("DOM interactive = " + p.interactive);

    // document load and unload time
    console.log("document load = " + (p.loadEventEnd - p.loadEventStart));
    console.log("document unload = " + (p.unloadEventEnd - p.unloadEventStart));

    // other properties
    console.log("type = " + p.type);
    console.log("redirectCount = " + p.redirectCount);
  }
}

Specifications

Specification
Navigation Timing Level 2
# dom-performancenavigationtiming-loadeventstart

Browser compatibility

BCD tables only load in the browser