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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/PerformanceElementTiming/identifier below:

PerformanceElementTiming: identifier property - Web APIs

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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.

A string.

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.

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

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

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