The identifier
read-only property of the PerformanceElementTiming
interface returns the value of the elementtiming
attribute on the element.
PerformanceElementTiming.identifier
Value
A DOMString
.
Examples
In this example the value of elementtiming
is big-image
. Calling entry.identifier
therefore returns the string big-image
.
<img src="image.jpg" alt="a nice image" elementtiming="big-image" id="myImage">
const observer = new PerformanceObserver((list) => { let entries = list.getEntries().forEach(function (entry) { if (entry.identifier === "big-image") { console.log(entry.naturalWidth); } }); }); observer.observe({ entryTypes: ["element"] });
Note: This example uses the PerformanceObserver
interface to create a list of performance measurement events. In our case we observe the PerformanceEntry.entrytype
element
in order to use the PerformanceElementTiming
interface.
Specifications
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 | |
identifier |
77
|
79
|
No
|
No
|
64
|
No
|
77
|
77
|
No
|
55
|
No
|
12.0
|
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/PerformanceElementTiming/identifier