PerformanceElementTiming: identifier property
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
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
| Specification |
|---|
| Element Timing API # dom-performanceelementtiming-identifier |