Function _getShadowRoot

src/cdk/platform/features/shadow-dom.ts:22–34

(element: HTMLElement)

/** Gets the shadow root of an element, if supported and the element is inside the Shadow DOM. */
export function _getShadowRoot(element: HTMLElement): ShadowRoot | null {
  if (_supportsShadowDom()) {
    const rootNode = element.getRootNode ? element.getRootNode() : null;

    // Note that this should be caught by `_supportsShadowDom`, but some
    // teams have been able to hit this code path on unsupported browsers.
    if (typeof ShadowRoot !== 'undefined' && ShadowRoot && rootNode instanceof ShadowRoot) {
      return rootNode;
    }
  }

  return null;
}

/**
 * Gets the currently-focused element on the page while