shouldFloatFooter function - mutationObserver

FloatingFooterWithReact-3e.tsx

const onFooterContainerChange = useCallback(
  node => {
    if (node !== null) {
      setFooterContainerElement(node);

      if (mutationObserver) {
        mutationObserver.observe(node, {
          childList: true,
          characterData: true,
          attributes: true,
          subtree: true,
        });

        if (scrollingElement) {
          mutationObserver.observe(scrollingElement, {
            childList: true,
            characterData: true,
            attributes: true,
            subtree: true,
          });
        }
      }
    }
  },
  [mutationObserver, scrollingElement]
);