PerformanceElementTiming.identifier
The identifier
read-only property of the PerformanceElementTiming
interface returns the value of the elementtiming
attribute on the element.
Value
A DOMString
.
Examples
In this example 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) => {
let entries = list.getEntries().forEach(function (entry) {
if (entry.identifier === "big-image") {
console.log(entry.naturalWidth);
}
});
});
observer.observe({ entryTypes: ["element"] });
Note: 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 |
---|
Element Timing API # ref-for-dom-performanceelementtiming-identifier |
Browser compatibility
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