PerformanceElementTiming.identifier

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

Syntax

var identifier = PerformanceElementTiming.identifier;

Value

A DOMString.

Examples

In this example the value of elementtiming is big-image. Calling entry.indentifier 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"] });

Specifications

Browser compatibility