PerformanceElementTiming.renderTime
The renderTime
read-only property of the PerformanceElementTiming
interface returns the render time of the associated element.
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"] });
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-rendertimeā |
Browser compatibility
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