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Before we can track the intersection of an element with a container, we need to know what that container is. That container is the intersection root, or root element. This can be either a specific element in the document which is an ancestor of the element to be observed, or null to use the document's viewport as the container.

The root intersection rectangle is the rectangle used to check against the target or targets. This rectangle is determined like this:

• If the intersection root is the implicit root (that is, the top-level Document), the root intersection rectangle is the viewport's rectangle.

• If the intersection root has an overflow clip, the root intersection rectangle is the root element's content area.

• Otherwise, the root intersection rectangle is the intersection root's bounding client rectangle (as returned by calling getBoundingClientRect() on it).

The root intersection rectangle can be adjusted further by setting the root margin, rootMargin, when creating the IntersectionObserver. The values in rootMargin define offsets added to each side of the intersection root's bounding box to create the final intersection root bounds (which are disclosed in IntersectionObserverEntry.rootBounds when the callback is executed).

Before we can track the intersection of an element with a container, we need to know what that container is. That container is the intersection root, or root element. This can be either a specific element in the document which is an ancestor of the element to be observed, or null to use the document's viewport as the container.

The root intersection rectangle is the rectangle used to check against the target or targets. This rectangle is determined like this:

• If the intersection root is the implicit root (that is, the top-level Document), the root intersection rectangle is the viewport's rectangle.

• If the intersection root has an overflow clip, the root intersection rectangle is the root element's content area.

• Otherwise, the root intersection rectangle is the intersection root's bounding client rectangle (as returned by calling getBoundingClientRect() on it).

The root intersection rectangle can be adjusted further by setting the root margin, rootMargin, when creating the IntersectionObserver. The values in rootMargin define offsets added to each side of the intersection root's bounding box to create the final intersection root bounds (which are disclosed in IntersectionObserverEntry.rootBounds when the callback is executed).

Before we can track the intersection of an element with a container, we need to know what that container is. That container is the intersection root, or root element. This can be either a specific element in the document which is an ancestor of the element to be observed, or null to use the document's viewport as the container.

The root intersection rectangle is the rectangle used to check against the target or targets. This rectangle is determined like this:

• If the intersection root is the implicit root (that is, the top-level Document), the root intersection rectangle is the viewport's rectangle.

• If the intersection root has an overflow clip, the root intersection rectangle is the root element's content area.

• Otherwise, the root intersection rectangle is the intersection root's bounding client rectangle (as returned by calling getBoundingClientRect() on it).

The root intersection rectangle can be adjusted further by setting the root margin, rootMargin, when creating the IntersectionObserver. The values in rootMargin define offsets added to each side of the intersection root's bounding box to create the final intersection root bounds (which are disclosed in IntersectionObserverEntry.rootBounds when the callback is executed).

intersection root's bounding box to create the final intersection root bounds (which are disclosed in IntersectionObserverEntry.rootBounds when the callback is executed).

intersection root's bounding box to create the final intersection root bounds (which are disclosed in IntersectionObserverEntry.rootBounds when the callback is executed).

intersection root's bounding box to create the final intersection root bounds (which are disclosed in IntersectionObserverEntry.rootBounds when the callback is executed).

intersection root's bounding box to create the final intersection root bounds (which are disclosed in IntersectionObserverEntry.rootBounds when the callback is executed).