PerformanceElementTiming.renderTime

The renderTime read-only property of the PerformanceElementTiming interface returns the render time of the associated element.

Syntax

var renderTime = PerformanceElementTiming.renderTime;

Value

A DOMHighResTimeStamp with the render time of the element.

For images this will be the image rendering timestamp. This is defined as the next paint that occurs after the image becomes fully loaded. If the timing allow check fails (as defined by the Timing-allow-origin header) this will return 0.

For text nodes this will be the text rendering timestamp. This is defined as when the element becomes text painted.

Examples

In this example calling entry.renderTime returns the render time of the image element.

<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.renderTime);
    }
  });
});
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
Element Timing API
# ref-for-dom-performanceelementtiming-rendertimeā‘ 

Browser compatibility

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