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"] });

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

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

Browser compatibility

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