PerformanceElementTiming.loadTime

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The loadTime read-only property of the PerformanceElementTiming interface always returns 0 for text. For images it returns the time which is the latest between the time the image resource is loaded and the time it is attached to the element.

Value

A DOMHighResTimeStamp with the loadTime of the element.

Examples

In this example calling entry.loadTime returns the loadTime of the image element.

<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.loadTime);
    }
  });
});
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-loadtime①

Browser compatibility

BCD tables only load in the browser