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The root read-only property of the IntersectionObserver interface identifies the Element or Document whose bounds are treated as the bounding box of the viewport for the element which is the observer's target.
If the root is null, then the bounds of the actual document viewport are used.
A Element or Document object whose bounding box is used as the bounds of the viewport for the purposes of determining how much of the target element is visible. The intersection of this bounding rectangle, offset by any margins specified in the options passed to the IntersectionObserver() constructor, the target element's bounds, minus the bounds of every element or other object which overlaps the target element, is considered to be the visible area of the target element.
If root is null, then the owning document is used as the root, and the bounds its viewport (that is, the visible area of the document) are used as the root bounds.
This example sets the border of the intersection observer's root element to be a 2-pixel medium green line.
observer.root.style.border = "2px solid #44aa44";
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