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 王天杨
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/**
* Gets the actual active element, traversing through shadow roots if necessary.
*
* When an element inside a shadow root has focus, `document.activeElement` returns
* the shadow host element. This function recursively traverses shadow roots to find
* the actual focused element.
*
* @param root - The document or shadow root to start the search from.
* @returns The actual focused element, or null if no element has focus.
*
* @example
* // In a shadow DOM context
* const activeElement = getActiveElement(document);
* // Returns the actual focused element inside the shadow root
*
* @example
* // Starting from a specific document
* const activeElement = getActiveElement(ownerDocument(element));
*/
export default function activeElement(doc: Document | ShadowRoot): Element | null;
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