Function onBlur

packages/react-aria/src/focus/FocusScope.tsx:422–453

    };

    let onBlur: EventListener = e => {
      // Firefox doesn't shift focus back to the Dialog properly without this
      if (raf.current) {
        cancelAnimationFrame(raf.current);
      }
      raf.current = requestAnimationFrame(() => {
        // Patches infinite focus coersion loop for Android Talkback where the user isn't able to move the virtual cursor
        // if within a containing focus scope. Bug filed against Chrome: https://issuetracker.google.com/issues/384844019.
        // Note that this means focus can leave focus containing modals due to this, but it is isolated to Chrome Talkback.
        let modality = getInteractionModality();
        let shouldSkipFocusRestore =
          (modality === 'virtual' || modality === null) && isAndroid() && isChrome();

        // Use document.activeElement instead of e.relatedTarget so we can tell if user clicked into iframe
        let activeElement = getActiveElement(ownerDocument);
        if (
          !shouldSkipFocusRestore &&
          activeElement &&
          shouldContainFocus(scopeRef) &&
          !isElementInChildScope(activeElement, scopeRef)
        ) {
          activeScope = scopeRef;
          let target = getEventTarget(e) as FocusableElement;
          if (target && target.isConnected) {
            focusedNode.current = target;
            focusElement(focusedNode.current);
          } else if (activeScope.current) {
            focusFirstInScope(activeScope.current);
          }
        }
      });
    };

    ownerDocument.addEventListener('keydown', onKeyDown, false);
    ownerDocument.addEventListener('focusin', onFocus, false);