1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 function isOptionElementToggleable(option) {
6 if (option.tagName.toLowerCase() != 'option')
7 throw new Error('element is not an option');
8 for (var parent = option.parentElement;
10 parent = parent.parentElement) {
11 if (parent.tagName.toLowerCase() == 'select') {
12 return parent.multiple;
15 throw new Error('option element is not in a select');