code-lab/node_modules/vuetify/lib/util/dom.mjs

/**
 * Returns:
 *  - 'null' if the node is not attached to the DOM
 *  - the root node (HTMLDocument | ShadowRoot) otherwise
 */
export function attachedRoot(node) {
  /* istanbul ignore next */
  if (typeof node.getRootNode !== 'function') {
    // Shadow DOM not supported (IE11), lets find the root of this node
    while (node.parentNode) node = node.parentNode;

    // The root parent is the document if the node is attached to the DOM
    if (node !== document) return null;
    return document;
  }
  const root = node.getRootNode();

  // The composed root node is the document if the node is attached to the DOM
  if (root !== document && root.getRootNode({
    composed: true
  }) !== document) return null;
  return root;
}
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