Web/API/PerformanceResourceTiming/initiatorType

The initiatorType read-only property is a string that represents the type of resource that initiated the performance event.

The value of this string is as follows:

• If the initiator is a Element, the property returns the element's localName.
• If the initiator is a CSS resource, the property returns "css".
• If the initiator is a XMLHttpRequest object, the property returns "xmlhttprequest".
• If the initiator is a PerformanceNavigationTiming object, the property returns an empty string ("").

Note: This feature is available in Web Workers.

Syntax

resource.initiatorType;

Return value

A string representing the type of resource that initiated the performance event, as specified above.

Example

function print_PerformanceEntries() {
  // Use getEntriesByType() to just get the "resource" events
  var p = performance.getEntriesByType("resource");
  for (var i=0; i < p.length; i++) {
    print_initiatorType(p[i]);
  }
}
function print_initiatorType(perfEntry) {
  // Print this performance entry object's initiatorType value
  var value = "initiatorType" in perfEntry;
  if (value)
    console.log("... initiatorType = " + perfEntry.initiatorType);
  else
    console.log("... initiatorType = NOT supported");
}

Specifications

Specification	Status	Comment
Resource Timing Level 1The definition of 'initiatorType' in that specification.	Candidate Recommendation	Initial definition.

Browser compatibility

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
initiatorType	Chrome Full support 43	Edge Full support 12	Firefox Full support 40	IE No support No	Opera Full support 30	Safari Full support 11	WebView Android Full support 43	Chrome Android Full support 43	Firefox Android Full support 42	Opera Android Full support 30	Safari iOS Full support 11	Samsung Internet Android Full support 4.0

Legend

Full support  

Full support

No support  

No support

PerformanceResourceTiming.initiatorType by Mozilla Contributors is licensed under CC-BY-SA 2.5.