IntersectionObserver
API that can be used to understand the visibility and position of DOM elements relative to a containing element or to the top-level viewport. The position is delivered asynchronously and is useful for understanding the visibility of elements and implementing pre-loading and deferred loading of DOM content.
css property: position-visibility
css property: position-visibility: always
css property: position-visibility: anchors-visible
css property: position-visibility: no-overflow
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