The id read-only property of the PerformanceElementTiming interface returns the id of the associated element.


var id =;


A DOMString.


In this example calling will log to the console myImage, this being the id of the image element.

<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") {
observer.observe({ entryTypes: ["element"] });

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.


Specification Status Comment
Element Timing
The definition of '' in that specification.
Editor's Draft Initial definition.

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