Function closestTableSection

src/cdk/table/table.ts:1665–1682

* Finds the closest table section to an outlet. We can't use `HTMLElement.closest` for this, * because the node representing the outlet is a comment.

(outlet: RowOutlet, section: string)

 * because the node representing the outlet is a comment.
 */
function closestTableSection(outlet: RowOutlet, section: string): HTMLElement | null {
  const uppercaseSection = section.toUpperCase();
  let current: Node | null = outlet.viewContainer.element.nativeElement;

  while (current) {
    // 1 is an element node.
    const nodeName = current.nodeType === 1 ? (current as HTMLElement).nodeName : null;
    if (nodeName === uppercaseSection) {
      return current as HTMLElement;
    } else if (nodeName === 'TABLE') {
      // Stop traversing past the `table` node.
      break;
    }
    current = current.parentNode;
  }

  return null;
}