PerformanceElementTiming.intersectionRect
The intersectionRect
read-only property of the PerformanceElementTiming
interface returns the rectangle of the element within the viewport.
Value
A DOMRectReadOnly
which is the rectangle of the element within the viewport.
For display images this is the display rectangle of the image within the viewport. For text this is the display rectangle of the node in the viewport. This being the smallest rectangle that contains the union of all text nodes that belong to the element.
Examples
In this example calling entry.intersectionRect
returns a DOMRectReadOnly
object with the display rectangle of the 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.intersectionRect);
}
});
});
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-intersectionrect |
Browser compatibility
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