https://www.abn.ne/media/com_wrapper/js/iframe-height.js?2c4338

1/**
2 * @copyright   (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
3 * @license     GNU General Public License version 2 or later; see LICENSE.txt
4 */
5
6((window, document) => {
7  window.iFrameHeight = iframe => {
8    const doc = 'contentDocument' in iframe ? iframe.contentDocument : iframe.contentWindow.document;
9    const height = parseInt(doc.body.scrollHeight, 10);
10    if (!document.all) {
11      iframe.style.height = `${parseInt(height, 10) + 60}px`;
12    } else if (document.all && iframe.id) {
13      document.all[iframe.id].style.height = `${parseInt(height, 10) + 20}px`;
14    }
15  };
16})(window, document);