| // Copyright 2022 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| /** |
| * @param {Node} el A node to search for ancestors with |className|. |
| * @param {string} className A class to search for. |
| * @return {Element} A node with class of |className| or null if none is found. |
| */ |
| export function findAncestorByClass(el, className) { |
| while (el !== null) { |
| if (el.classList && el.classList.contains(className)) { |
| break; |
| } |
| el = el.parentNode; |
| } |
| return el; |
| } |
