The PerformanceObserver interface is used to observe performance measurement events and be notified of new performance entries as they are recorded in the browser's performance timeline.
Note: This feature is available in Web Workers
PerformanceObserver
Constructor
-
PerformanceObserver() -
Creates and returns a new
PerformanceObserverobject.
Properties
-
PerformanceObserver.supportedEntryTypesRead only -
Returns an array of the
entryTypevalues supported by the user agent.
Methods
-
PerformanceObserver.observe() -
Specifies the set of
entry typesto observe. The performance observer's callback function will be invoked when aperformance entryis recorded for one of the specifiedentryTypes -
PerformanceObserver.disconnect() -
Stops the performance observer callback from receiving
performance entries. -
PerformanceObserver.takeRecords() -
Returns the current list of
performance entriesstored in the performance observer, emptying it out.
Example
function observer_callback(list, observer) { // Process the "measure" event } let observer = new PerformanceObserver(observer_callback); observer.observe({entryTypes: ["measure"]});
Specifications
| Specification |
|---|
| Performance Timeline # dom-performanceobserver |
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
PerformanceObserver |
52
|
79
|
57
|
No
|
39
|
11
|
52
|
52
|
57
|
41
|
11
|
6.0
|
PerformanceObserver |
52
|
79
|
57
|
No
|
39
|
11
|
52
|
52
|
57
|
41
|
11
|
6.0
|
disconnect |
52
|
79
|
57
|
No
|
39
|
11
|
52
|
52
|
57
|
41
|
11
|
6.0
|
observe |
52
|
79
|
57
|
No
|
39
|
11
|
52
|
52
|
57
|
41
|
11
|
6.0
|
supportedEntryTypes |
73
|
79
|
68
|
No
|
60
|
12.1
|
73
|
73
|
68
|
52
|
12.2
|
11.0
|
takeRecords |
65
|
79
|
60
|
No
|
52
|
15
|
65
|
65
|
60
|
47
|
15
|
9.0
|
worker_support |
62
|
79
|
57
|
No
|
49
|
11
|
62
|
62
|
57
|
46
|
11
|
8.0
|
See also
© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/PerformanceObserver
