Function queryAll

packages/core/test/acceptance/integration_spec.ts:4027–4029

* Queries the provided `root` element for sub elements by the selector and casts the result as an * array of elements

(root: HTMLElement, selector: string)

 * array of elements
 */
function queryAll(root: HTMLElement, selector: string): HTMLElement[] {
  return Array.from(root.querySelectorAll(selector));
}