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PerformanceElementTiming: identifier property

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

The identifier read-only property of the PerformanceElementTiming interface returns the value of the elementtiming attribute on the element.

Value

A string.

Examples

Using identifier

In this example an <img> element is being observed by adding the elementtiming attribute. A PerformanceObserver is registered to get all performance entries of type "element" and the buffered flag is used to access data from before observer creation. The value of elementtiming is big-image. Calling entry.identifier therefore returns the string big-image.

html

<img
  src="image.jpg"
  alt="a nice image"
  elementtiming="big-image"
  id="myImage" />

js

const observer = new PerformanceObserver((list) => {
  list.getEntries().forEach((entry) => {
    if (entry.identifier === "big-image") {
      console.log(entry.naturalWidth);
    }
  });
});
observer.observe({ type: "element", buffered: true });

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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https://developer.mozilla.org/en-US/docs/Web/API/PerformanceElementTiming/identifier